Milestones are zero-day activities that call attention to noteworthy events in a project schedule. They may indicate either the start or completion of a significant series of events.

You can add a milestone task from the Add option on the Interactive Gantt or by setting the duration of the task as 0d.
When you assign resources to this task, the allocation will automatically be pre-filled by 0%.
A milestone has 0 duration and as such has no additional calculation effect on the schedule.
A milestone can be linked to other tasks.
You can set constraint dates on a milestone.
Milestones are not shown on the Resource Load Chart.

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