Duplicate parent task in Gantt Chart Work View

I would love the ability to duplicate a parent task from the gantt chart work view. 

At present if our team needs to add another phase to a project with all of the standard sub-tasks for that parent task - we need to go to list view or board view to duplicate task then go back to Gantt view to enter predecessors - it is not a nice workflow.

Open for any other ways around this!