Hello there, DCrocker.
Thanks for checking in with us. Allow me to share some information about linking bank accounts for Merchant Services.
At this time, we can only link one bank account for payments made using the Merchant Service.
Just in case you want to know more about how to link your Merchant account, here's an article for your reference: Link your merchant account.
Let me know if you have follow-up questions about this. I'm still here whenever you need help while working with reconciliation in QuickBooks Desktop.