Hello there, chris48.
If you'd like to connect your bank to QBO you only need to use your login credentials and not your account numbers. You can refer to this article for more details on how to add and connect bank and credit card accounts.
When entering bank deposits you'll need to enter the account where you got the funds.
Refer to this article guide for more details on how to record bank deposits.
Get back to me if you have additional concerns.