Creating a List of Optional Milestones
Activate the Administer Lists module (Admin>Administer Lists).
Right click anywhere on the PDW Lists worksheet and select Edit Lookup List.
In the Sheet Type drop down box, select "Milestone".
In the New Value text box, enter a value and press the Enter key on the keyboard.
Continue adding entries. When done, click the Save button and then click Close to exit the dialog.
Right click anywhere on the sheet and select Save to Database.