Hello, @JeffLyden.
I appreciate the details that you've given. Allow me to provide additional insights into this concern.
When importing an .IIF file into QuickBooks Desktop if the account is already existing, transactions will automatically be posted into their designated account. If the account is not recognized by QuickBooks, this will create a new account.
For now, I'd suggest opening your .IIF file on an excel and see if the accounts there are correct. If you're seeing an incorrect account you can edit it so it will be identified by QuickBooks. If you've verified that all accounts are correct, I'd recommend reaching out to your Third Party Service Provider. This is to ensure that your accounts will be mapped accurately upon importing.
Also, you can merge the newly created account to the new one to consolidate all transactions without needing to enter transactions again one by one and update information as needed.
I've included some helpful articles about importing .IIF file in QuickBooks Desktop for your reference:
This amount of information should get you moving today, Jeff.
Please let me know if you need further assistance with this matter. I'll make sure to get back to you as soon as I can. Have a great day!
