Like Your Bill NO. is like : 001/2020-21 so Add in Bill Prefix like %BILLNO%/2020-21

OR

Your PO No. is like ABC-001/2021-22 then Add in PO Prefix like ABC-%PONO%/2021-22
OR

Your JW PO No. is like JW-001/2021-22 then Add in PO Prefix like JW-%JWNO%/2021-22