Before your project gets rolling, you will probably want to mark its major goals with milestones.
The third entry on the left menu of a project in Team Space is Milestones. Here you have an overview of all the set milestones to track one or multiple tasks within your project. Basically, milestones provide a way to more accurately estimate the time it will take to complete your project by marking important dates and events.
How to add a milestone?
To add a milestone or more precisely to add this to a task or subtask, all you have to do is click Edit, check the milestone checkmark when adding a new task or editing an existing one, as seen in Figure 9, below.