Hello there, @mary37.

If you're referring to switching bank accounts for Online Banking, we can simply click the bank on the banking page to view its transactions.

However, the option to add another bank account when running payroll or accepting payments through QuickBooks Payments is unavailable in QuickBooks Online (QBO).

In case you need to review your downloaded bank transactions in QBO, we can assign or categorize them. This way, we can make sure all of the transactions are correct.

Just click the Reply button if you need anything else. I'll gladly help.