A milestone Indicates a task with a zero duration. Milestones mark an event that must be reflected in your project plan, such as the approval of a design or an assembly line startup.
To create a milestone in the Task Data view:
Or
In the Chart view, Project KickStart changes the taskbar to a milestone icon
.
To create a milestone in Chart view:
In the Task Data view, Project KickStart changes the Days for this task to 0 (zero).