Something like:
//For PLAN - target
*SELECT(%PRODS%,[NEW_PRODUCT_NAME],ENTITY,[ID]=%ENTITY_SET%)
*SELECT(%ISPLAN%,[ID],CATEGORY,[ID]=$TARGET_CATEGORY$ AND [ID]=PLAN)
*XDIM_MEMBERSET CATEGORY = $SOURCE_CATEGORY$
*FOR %I%=%ISPLAN% // if not plan - nothing will be executed!
*FOR %E%=%ENTITY_SET% AND %P%=%PRODS%
*XDIM_MEMBERSET ENTITY=%E%
*XDIM_MEMBERSET PRODUCT=%P%
*WHEN ENTITY
*IS * //scoped to %E%
*REC(EXPRESSION=%VALUE%,CATEGORY=$TARGET_CATEGORY$)
*ENDWHEN
*NEXT
*NEXT
Vadim