I've done this in the past. Assuming this customer has no open invoice customers. First you do period end, so there are no payment records. Then you export the customer master records for later reimport with the OpenItemCustomer$ field set to ""Y"". Export all of the balance forward records. Back up the company, then reinitialize the three files listed in the Sage KB above. Import the customer records with OpenItemCustomer$ to ""Y"". Import the balances as a standard invoice with a balance. Rebuild sorts. You may have to create the alternate invoice file from the import for the standard invoice, if so, rebuld sorts after. Or build or have some MD build the utility to do the process as listed in support KB. I've done it both ways. The program is probably simpler and safer, but you can do it manually.