[ADD] project: task dependencies

task-4413833

closes odoo/documentation#11671

X-original-commit: a8959a121a
Signed-off-by: Audrey Vandromme (auva) <auva@odoo.com>
Signed-off-by: Guillaume Gallant (guga) <guga@odoo.com>

content/applications/services/project/tasks.rst

@@ -11,3 +11,4 @@ Task management
    tasks/task_creation
    tasks/recurring_tasks
    tasks/sub-tasks
+   tasks/task_dependencies

content/applications/services/project/tasks/task_dependencies.rst

@@ -0,0 +1,44 @@
+=================
+Task dependencies
+=================
+
+Odoo Project allows you to break down projects into tasks and establish relationships between those
+tasks to determine the order in which they are executed. Task dependencies ensure that certain tasks
+begin only after the preceding tasks are completed.
+
+To enable task dependencies in projects, go to :menuselection:`Project --> Configuration -->
+Settings`, enable :guilabel:`Task Dependencies`, and click :guilabel:`Save`.
+
+Set task dependencies
+=====================
+
+Task dependencies can be created from the task form or the project's Gantt view by linking the
+successor task (i.e., the task blocked by other tasks) to its predecessor task(s) (i.e., the tasks
+blocking the successor task).
+
+To create task dependencies from the task form, access the desired task and, in the
+:guilabel:`Blocked by` tab, click :guilabel:`Add a line`. Click :guilabel:`View` to access the
+predecessor task. To access the successor tasks from the predecessor task, click the
+:guilabel:`Blocked Tasks` smart button.
+
+To create a task dependency from the Gantt view, hover your mouse over the predecessor task, then
+click one of the dots that appear around it. Drag and drop the dot onto the successor task. An arrow
+appears, indicating the dependency from the predecessor task to the successor.
+
+.. image:: task_dependencies/task-dependency.png
+   :scale: 80%
+   :alt: Task dependency
+
+Odoo automatically manages task progress based on their dependency. Successor tasks are assigned the
+:guilabel:`Waiting` status and cannot be moved to :guilabel:`In Progress` until their predecessor
+task(s) are marked as :guilabel:`Approved`, :guilabel:`Cancelled`, or :guilabel:`Done`.
+
+Remove dependencies
+===================
+
+To remove a task dependency, proceed as follows:
+
+- From the task form, go to the **Blocked by** tab and click the :icon:`fa-times`
+  (:guilabel:`times`) button.
+- From the Gantt view, click the red :icon:`fa-times` (:guilabel:`times`) button that appears at the
+  center of the arrow when you hover your mouse over it.