I appreciate you coming back to us for additional support, @platinumedition.

Allow me to join this thread again and share some more insights about integrating Shopify with QuickBooks.

Customizing or editing the account mapping in QuickBooks is currently not an option since those transactions are dependent with your third-party application. Another, your access on your Shopify account might also have limitations which will require you to directly get in touch with their customer service team. 

They have the tools needed to correct the mapping preference of the transactions.

That's it. Keep me posted again if you have more questions for me. You can mention my name or click the "Reply" button. I'd like to make sure that this is taken care of.