Thanks for joining the thread, @ashlee1.

Same with QuickBooks Desktop, you’ll have to manually edit each check and change the bank account linked to it. 

Here’s how:

1. Go to Expenses from the left navigation.
2. On the Expense Transactions page, locate the check.
3. Click the Action column drop-down of that check and select View/Edit.
4. Update the bank.
5. Hit Save and close.

For future reference, take a look at this article: Add or edit transactions in a register.

Leave a comment below if you need further assistance. I’m more than happy to help. Take care!