How to add more location to a task:
1 - Open the task and its properties window.
2 - Click on the "+" button in the Location section.
3 - Select a project and a tasklist where you'd like to add the task.
4 - Hit Add New Location.
5 - You can remove a task's location by clicking on the "x" icon next to it.
NOTE:
A task can exist in multiple locations only between Public or Private projects with Full Access permission setting.
Optional: Adding a location for all of its subtasks. If not selected, the subtasks/checklists of the task will still appear in the alternative location, but the subtask will show its source project as an actual location.
Only task properties are kept, comments and files are not included.

