I HAVE CREATED AN INVOICE TEMPLATE IN EXCEL. THIS HAS AN AUTONUMBERING CODE FOR THE SERIAL NUMBER. EACH TIME A INVOICE IS MADE AND THEN SAVED THE REOPENING SHOWS THE NEXT SERIAL NUMBER. I ALSO NEED TO LOCK THE CELL CONTAINING THE FORMULA BEING EDITED. I HAVE MANAGED THIS AS WELL. SO FAR SO GOOD. HOWEVER, WHEN I OPEN THE INVOICE THE AUTO NUMBERING FORMULA DOES NOT WORK. ANY SUGGESTIONS PLEASE. I CAN USE THIS TEMPLATE AS AN EXCISE INVOICE ONCE THIS PROBLEM IS SOLVED. THANKS