When creating project plans in Microsoft Project, you will often be tracking a number of different milestones and not all of them are treated equally. For example, your company may have certain governance (PMO) milestones to track while your individual team might have certain milestones that they care about. You as a Project Manager may also have even other milestones to track.
If you are working on a large project, then it might be a good idea to create rolled-up milestones. This offers you the capability to see all the milestone dates at-a-glance, like the picture shown below.
The following short video shows just how easy it is to create these rolled up milestones.