Window/Door Schedule Label Numbering

[BeaconHill]

Just working on a 2 phase renovation project and have 2 separate window/door schedules for each phase. I am able to get the windows and doors showing on each schedule properly by defining custom categories in the schedule. However the numbering for the callouts under the Number column restart with W01, W02 etc. So I end up having 2 different windows using W01.  Would like them to continue on so W01, W02, W03 in the first schedule, and then W04, W05  on the second schedule. But I do not see anywhere that you can get the window numbers to change to what I want with the callouts on. I can get rid of the callouts and just do custom labels, which is what I will probably do. But would be nice to keep the callouts. Hope this makes sense. Thanks!

[DBCooper]

Have you tried changing the "schedule number start"?  It's under "labels" when you open the schedule.