Project to Milestones wizard - Choose additional columns
On the Choose additional columns screen in the Project to Milestones wizard, it is possible to import Microsoft Project fields into columns on the schedule.
Pick up to 10 columns to show (up to 5 to the left of the schedule area and up to 5 to the right of the schedule area.)
Choose from a list of available fields.
It's also possible to add a column after the schedule has been imported.