Nothing is easy. : )
Can you show the code you have tried? Did it involve RETAIN? That will help others help you.
The Boston Area SAS Users Group (BASUG) is hosting our
in person SAS Blowout on Oct 18!
This full-day event in Cambridge, Mass features four presenters from SAS, presenting on a range of SAS 9 programming topics. Pre-registration by Oct 15 is required.
Full details and registration info at
https://www.basug.org/events.