First define a group in the BMS as below:
BANKNBR DFHMDF POS=(ROWNO,COLNO),ATTRB=(UNPROT,NUM), X
LENGTH=4,GRPNAME=BANKS,OCCURS=11
BANK1 DFHMDF POS=(ROWNO,1),LENGTH=4,ATTRB(UNPROT,NUM), X
GRPNAME=BANKS
BANK2 DFHMDF POS=(ROWNO,6),LENGTH=4,ATTRB(UNPROT,NUM), X...