I HAVE CREATED 5 COLUMNS IN SALES INVOICE NAMELY 30,32,34,36,38,40. THESE COLUMNS ARE GOING TO CONTAIN QUANTITIES OF THE PRODUCTS IN DIFFERENT SIZES.
IS THERE ANY WAY TO SUM ALL THESE FIVE COLUMNS AND PUT THE SUM IN QUANTITY COLUMN ( i,e THE QUANTITY BOX WILL CONTAIN THE SUM OF THESE 5 COLUMNS)
THANK YOU IN ADVANCE