On the milestones page you will be able to see which milestones you have created
In the top right corner of the Milestone page you have a button for creating a “New milestone”.
You can use the milestones in many different ways:
For setting a due date every quarter
Setting a due date by the end of the month
Before construction start
etc.
The milestones work as a tool to set more than one due date. So when you set a due date for a topic, you can choose a milestone the topic will be apart of.