diff --git a/app/controllers/my_module_repositories_controller.rb b/app/controllers/my_module_repositories_controller.rb
index b2a201544..1cb81a6c0 100644
--- a/app/controllers/my_module_repositories_controller.rb
+++ b/app/controllers/my_module_repositories_controller.rb
@@ -3,12 +3,13 @@
 class MyModuleRepositoriesController < ApplicationController
   include ApplicationHelper
 
-  before_action :load_my_module
+  before_action :load_my_module, except: :assign_my_modules
   before_action :load_repository, except: %i(repositories_dropdown_list repositories_list_html create)
-  before_action :check_my_module_view_permissions, except: %i(update consume_modal update_consumption)
+  before_action :check_my_module_view_permissions, except: %i(update consume_modal update_consumption assign_my_modules)
   before_action :check_repository_view_permissions, except: %i(repositories_dropdown_list repositories_list_html create)
   before_action :check_repository_row_consumption_permissions, only: %i(consume_modal update_consumption)
   before_action :check_assign_repository_records_permissions, only: %i(update create)
+  before_action :load_my_modules, only: :assign_my_modules
 
   def index_dt
     @draw = params[:draw].to_i
@@ -41,6 +42,31 @@ class MyModuleRepositoriesController < ApplicationController
     render rows_view
   end
 
+  def assign_my_modules
+    assigned_count = 0
+    skipped_count = 0
+    status = :ok
+
+    ActiveRecord::Base.transaction do
+      @my_modules.find_each do |my_module|
+        service = RepositoryRows::MyModuleAssignUnassignService.call(
+          my_module:,
+          repository: @repository,
+          user: current_user,
+          params:
+        )
+        unless service.succeed?
+          status = :unprocessable_entity
+          raise ActiveRecord::Rollback 
+        end
+        assigned_count += service.assigned_rows_count
+        skipped_count += (params[:rows_to_assign].length - service.assigned_rows_count)
+      end
+    end
+
+    render json: { assigned_count:, skipped_count: }, status:
+  end
+
   def create
     repository_row = RepositoryRow.find(params[:repository_row_id])
     repository = repository_row.repository
@@ -215,6 +241,12 @@ class MyModuleRepositoriesController < ApplicationController
     render_404 unless @repository
   end
 
+  def load_my_modules
+    @my_modules = MyModule.where(id: params[:my_module_ids])
+
+    render_403 unless @my_modules.all? { |my_module| can_assign_my_module_repository_rows?(my_module) }
+  end
+
   def check_my_module_view_permissions
     render_403 unless can_read_my_module?(@my_module)
   end
diff --git a/app/javascript/vue/assign_items_to_tasks_modal/container.vue b/app/javascript/vue/assign_items_to_tasks_modal/container.vue
index d209ec569..18c89fd81 100644
--- a/app/javascript/vue/assign_items_to_tasks_modal/container.vue
+++ b/app/javascript/vue/assign_items_to_tasks_modal/container.vue
@@ -94,7 +94,7 @@
             </label>
 
             <SelectDropdown
-              :value="selectedTask"
+              :value="selectedTasks"
               :disabled="!selectedExperiment"
               :searchable="true"
               ref="tasksSelector"
@@ -102,6 +102,8 @@
               :options="tasks"
               :isLoading="tasksLoading"
               :placeholder="tasksSelectorPlaceholder"
+              :multiple="true"
+              :withCheckboxes="true"
               :no-options-placeholder="
                 i18n.t(
                   'repositories.modal_assign_items_to_task.body.task_select.no_options_placeholder'
@@ -115,7 +117,7 @@
             type="button"
             class="btn btn-primary"
             data-dismiss="modal"
-            :disabled="!selectedTask"
+            :disabled="!selectedTasks.length"
             @click="assign"
           >
             {{ i18n.t("repositories.modal_assign_items_to_task.assign.text") }}
@@ -127,6 +129,7 @@
 </template>
 
 <script>
+/* global HelperModule */
 import SelectDropdown from "../shared/select_dropdown.vue";
 
 export default {
@@ -143,7 +146,7 @@ export default {
       tasks: [],
       selectedProject: null,
       selectedExperiment: null,
-      selectedTask: null,
+      selectedTasks: [],
       projectsLoading: null,
       experimentsLoading: null,
       tasksLoading: null
@@ -206,9 +209,6 @@ export default {
     taskURL() {
       return `${this.urls.tasks}?experiment_id=${this.selectedExperiment
         || ''}`;
-    },
-    assignURL() {
-      return this.urls.assign.replace(':module_id', this.selectedTask);
     }
   },
   watch: {
@@ -259,7 +259,7 @@ export default {
       });
     },
     changeTask(value) {
-      this.selectedTask = value;
+      this.selectedTasks = value;
     },
     resetProjectSelector() {
       this.projects = [];
@@ -271,7 +271,7 @@ export default {
     },
     resetTaskSelector() {
       this.tasks = [];
-      this.selectedTask = null;
+      this.selectedTasks = [];
     },
     resetSelectors() {
       this.resetTaskSelector();
@@ -279,20 +279,33 @@ export default {
       this.resetProjectSelector();
     },
     assign() {
-      if (!this.selectedTask) return;
+      if (!this.selectedTasks.length) return;
 
       $.ajax({
-        url: this.assignURL,
-        type: 'PATCH',
+        url: this.urls.assign,
+        type: 'POST',
         dataType: 'json',
-        data: { rows_to_assign: this.rowsToAssign }
-      }).done(({ assigned_count }) => {
-        const skipped_count = this.rowsToAssign.length - assigned_count;
-
-        if (skipped_count) {
-          HelperModule.flashAlertMsg(this.i18n.t('repositories.modal_assign_items_to_task.assign.flash_some_assignments_success', { assigned_count, skipped_count }), 'success');
+        data: {
+          rows_to_assign: this.rowsToAssign,
+          my_module_ids: this.selectedTasks
+        }
+      }).done(({ assigned_count: assignedCount, skipped_count: skippedCount }) => {
+        if (skippedCount) {
+          HelperModule.flashAlertMsg(
+            this.i18n.t(
+              'repositories.modal_assign_items_to_task.assign.flash_some_assignments_success',
+              { assigned_count: assignedCount, skipped_count: skippedCount }
+            ),
+            'success'
+          );
         } else {
-          HelperModule.flashAlertMsg(this.i18n.t('repositories.modal_assign_items_to_task.assign.flash_all_assignments_success', { count: assigned_count }), 'success');
+          HelperModule.flashAlertMsg(
+            this.i18n.t(
+              'repositories.modal_assign_items_to_task.assign.flash_all_assignments_success',
+              { count: assignedCount }
+            ),
+            'success'
+          );
         }
       }).fail(() => {
         HelperModule.flashAlertMsg(this.i18n.t('repositories.modal_assign_items_to_task.assign.flash_assignments_failure'), 'danger');
@@ -309,7 +322,7 @@ export default {
         .dataTable()
         .api()
         .ajax
-        .reload();
+        .reload(null, false);
     }
   }
 };
diff --git a/app/views/repositories/_assign_items_to_task_modal.html.erb b/app/views/repositories/_assign_items_to_task_modal.html.erb
index 2f283c533..d0775223c 100644
--- a/app/views/repositories/_assign_items_to_task_modal.html.erb
+++ b/app/views/repositories/_assign_items_to_task_modal.html.erb
@@ -1,6 +1,6 @@
 <div
   class="assign-items-to-task-modal-container"
-  data-assign-url="<%= my_module_repository_path(":module_id") %>"
+  data-assign-url="<%= assign_my_modules_url(id: @repository.id) %>"
   data-projects-url="<%= inventory_assigning_project_filter_projects_path %>"
   data-experiments-url="<%= inventory_assigning_experiment_filter_experiments_path %>"
   data-tasks-url="<%= inventory_assigning_my_module_filter_my_modules_path %>"
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 035ac164b..df00be64e 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -2226,26 +2226,26 @@ en:
     modal_assign_items_to_task:
       title: "Assign to task"
       body:
-        description: "Type in the fields below to find the right task."
+        description: "Select the fields below to assign item to task(s)."
         project_select:
           label: "Project"
-          placeholder: "Enter project name"
+          placeholder: "Select or enter Project name"
           no_options_placeholder: "No projects available to select"
         experiment_select:
           label: "Experiment"
-          placeholder: "Enter Experiment name"
+          placeholder: "Select or enter Experiment name"
           disabled_placeholder: "Select Project to enable Experiment"
           no_options_placeholder: "No experiments available to select"
         task_select:
           label: "Task"
           placeholder: "Enter Task name"
-          disabled_placeholder: "Select Experiment to enable Task"
+          disabled_placeholder: "Select or enter Task name"
           no_options_placeholder: "No tasks available to assign items"
       assign:
         text: "Assign to task"
-        flash_all_assignments_success: "Successfully assigned %{count} item(s) to the task."
-        flash_some_assignments_success: "Successfully assigned %{assigned_count} item(s) to the task. %{skipped_count} item(s) were already assigned to the task."
-        flash_assignments_failure: "Failed to assign item(s) to task."
+        flash_all_assignments_success: "Successfully assigned %{count} item(s) to the task(s)."
+        flash_some_assignments_success: "Successfully assigned %{assigned_count} item(s) to the task(s). %{skipped_count} item(s) were already assigned to the task(s)."
+        flash_assignments_failure: "Failed to assign item(s) to task(s)."
     modal_delete_record:
       title: "Delete items"
       notice: "Are you sure you want to delete the selected item(s)?"
diff --git a/config/routes.rb b/config/routes.rb
index 13cfc8d3a..533673e6b 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -553,6 +553,7 @@ Rails.application.routes.draw do
         end
       end
     end
+    post 'repository/:id/assign_my_modules', to: 'my_module_repositories#assign_my_modules', as: :assign_my_modules
 
     resources :steps, only: %i(index update destroy show) do
       resources :step_orderable_elements do
diff --git a/spec/services/repository_rows/my_module_assign_unassign_service_spec.rb b/spec/services/repository_rows/my_module_assign_unassign_service_spec.rb
new file mode 100644
index 000000000..63725a55a
--- /dev/null
+++ b/spec/services/repository_rows/my_module_assign_unassign_service_spec.rb
@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe RepositoryRows::MyModuleAssignUnassignService do
+  let(:user) { create :user }
+  let(:team) { create :team, created_by: user }
+  let(:project) { create(:project, team:, created_by: user) }
+  let(:experiment) { create(:experiment, :with_tasks, project:) }
+  let(:my_module) { create(:my_module, experiment:) }
+
+  let(:repository) { create :repository, team:, created_by: user }
+  let(:rows) do
+    create_list(:repository_row, 10, repository:) do |row, i|
+      row.name = "My Row (#{i + 1})"
+    end
+  end
+  let(:service_call) { described_class.call(**valid_attributes) }
+  let(:valid_attributes) do
+    {
+      my_module:,
+      repository:,
+      user:,
+      params:
+    }
+  end
+  let(:rows_to_assign) { rows.take(6).pluck(:id) }
+  let(:rows_to_unassign) { repository.repository_rows.where.not(id: rows_to_assign).order(:id).pluck(:id) }
+
+  context 'single module' do
+    context 'assigning items' do
+      let(:rows_to_assign) { rows.take(6).pluck(:id) }
+      let(:rows_to_unassign) { repository.repository_rows.where.not(id: rows_to_assign).order(:id).pluck(:id) }
+      let(:params) do
+        {
+          rows_to_assign:,
+          rows_to_unassign:,
+          downstream: false
+        }
+      end
+
+      it 'creates a new assignment' do
+        expect { service_call }.to change { MyModuleRepositoryRow.count }.by rows_to_assign.count
+      end
+
+      it 'unassigns and assigns items' do
+        rows_to_unassign.each do |row_id|
+          my_module.my_module_repository_rows.create!(repository_row_id: row_id, assigned_by: user)
+        end
+
+        service_call
+        expect(
+          my_module.my_module_repository_rows.order(:repository_row_id).pluck(:repository_row_id)
+        ).to eq rows_to_assign
+      end
+
+      it 'does nothing' do
+        rows_to_assign.each do |row_id|
+          my_module.my_module_repository_rows.create!(repository_row_id: row_id, assigned_by: user)
+        end
+
+        expect { service_call }.to change { MyModuleRepositoryRow.count }.by 0
+      end
+    end
+
+    context 'unassigning' do
+      let(:params) do
+        {
+          rows_to_assign: [],
+          rows_to_unassign: rows.pluck(:id),
+          downstream: false
+        }
+      end
+      let(:rows_to_assign) { [] }
+      let(:rows_to_unassign) { rows.pluck(:id) }
+      it 'unassigns items' do
+        rows_to_unassign.each do |row_id|
+          my_module.my_module_repository_rows.create!(repository_row_id: row_id, assigned_by: user)
+        end
+        initial_count = my_module.my_module_repository_rows.count
+
+        service_call
+        expect(my_module.my_module_repository_rows.count).to eq 0
+        expect(my_module.my_module_repository_rows.count).to_not eq initial_count
+      end
+    end
+  end
+end