Manual Product Billing Milestones (BR54.4)
Use Manual Product Billing Milestones (BR54.4) to define and maintain milestones manually. A milestone is a significant point in an activity. You can either define milestones for personal tracking, or for automatic billing when a task is complete.
Unlike days or date milestones, that are identified by a set schedule and updated and billed regardless of the project status, manual milestones let you change the status when the milestone is reached.