Hi there, @rock and roll.

I'm here to share information about dealing with incorrect bank account issues in QuickBooks. 

Since your QuickBooks are not tied to a real bank, you don't have to transfer funds to the correct account. You can directly perform the steps provided by my colleague @MichelleBh while keeping the account being used.

Moreover, I'll also share this link where you can search for articles that can serve as your reference to guide you on how to enter expenses, pay bills, write checks, and manage suppliers in QuickBooks: QuickBooks Online Expenses and Vendors Help Articles.

Feel free to leave a reply if you have additional queries about managing bank accounts in QuickBooks. The Community team always has your back. Have a good one!