Hi Bob,
You can meet your requirement by tweaking the above script logic with the use of a For/Next loop, in combination with the TMVL parameter, similar to the code shown below:
*XDIM_MEMBERSET ACCOUNT=NET_SALES
*XDIM_MEMBERSET CATEGORY=ACTUAL
*XDIM_MEMBERSET ENTITY=1000
//*XDIM_MEMBERSET=BAS(2014.Q1)
*FOR %MONTH% = 2014.01, 2014.02, 2014.03
*WHEN TIME
*IS %MONTH%
*REC(FACTOR=1,CATEGORY="PLAN",TIME=TMVL(12,%MONTH%))
*ENDWHEN
*COMMIT
*NEXT
Hope this helps!
Best regards,
Vijay