Can SKU fields be scanned in Quickbooks to Shopify migration?

We ended up keeping the item number as it appears in Quickbooks in the SKU field and added the leading the leading zeros to create a 6 digit number which we put in the barcode field. This seems to be working well. Tech support could not tell me if I needed to have a 6 digit minimum barcode and then never got back to meso I figured it out myself. I added leading zeros in a spreadsheet (we have 13,000 products) and imported using matrixify.