A milestone is a significant event that is important for the entire project. In ProScheduler A milestone is an issue with 1 day duration and marked as Milestone. A milestone is shown as an diamond shape in the Gantt area, in Scheduler it is tagged with a diamond icon.
A milestone on Gantt view
A milestone on Scheduler
Convert a task to milestone
Open the menu on the Gantt bar and click “Convert to milestone”, you can also convert a milestone back to a task.