How do I easily connect my bank account to my QuickBooks online account? Mine keeps saying that an existing QuickBooks account is already linked, but it’s not.

Allow me to take care of your concern today, missbeckman85-gm.

In QuickBooks Online (QBO), you're unable to connect both the parent accounts and their subaccounts. The message you're getting happens when you connect a parent credit card account and its sub-accounts That said, you'll need to verify with your bank as to which bank account downloads the transactions.

Once verified, you can follow the steps below on how to create a sub-account:

1. Go to Accounting, then choose Chart of Accounts.
2. Click New or find the bank from your register. Click Edit.
   
3. Choose the Account and Detail types, then enter the desired name.
4. Select the Is sub-account box, then choose the parent account.
5. Click Save and Close. 
   

Here's an article for additional reference: About Bank or Credit Card Sub-account Setup.

Once your bank is connected, you may find this article helpful when categorizing bank transactions: Categorize and match online bank transactions in QuickBooks Online.

Of course, you're always welcome to visit us again if you need help managing your bank feeds. It will be my pleasure. Stay safe and have a great day ahead!