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Hello there, @mackenzieannryan.
At this time, adding a checking account in the same bank is unavailable in QuickBooks Online (QBO).
In the meantime, you'll need to disconnect the old account and connect the new account.
To disconnect the account:
For more details please check out this article about Disconnect or delete an account from the Downloaded Transactions page.
To connect the account:
Check out this article to learn more: Connect bank and credit card accounts to QuickBooks Online.
Just know I'm only a post away if you have any other questions. Have a good day!