QuickBooks allows you create an invoice/bill for multiple purchase orders; however, Sage 50 does not. To handle this, Sage 50 creates a separate invoice for each of the purchase orders during the conversion, using a numbering scheme similar to 100a, 100b, 100c, and so on. For instance, if you entered receipts for three purchase orders in QuickBooks on invoice/bill 1000, Sage 50 would create three invoices during the conversion: 1000a, 1000b, and 1000c.