You can quickly delete all tasks in a deliverable by clicking on the red x at the top of the deliverable box. Please note, deleting a deliverable will not only delete all post tasks associated with this deliverable (those in the deliverable box) but will also dissociate any non-Post tasks elsewhere in the project from the deliverable. It will not, however, delete those non-Post tasks associated previously with this deliverable, it will just mark their deliverable association as “none”.