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I can help you in deleting this bank from your QuickBooks Online (QBO) account, @jennifer50.
Please take note on the following when you delete a bank account:
To delete the bank:
Check out this article for more helpful details: Disconnect or delete an account. To help you organize your transactions on your reports and tax forms in the future, see this article: Understand the chart of accounts in QuickBooks.
Let us know if there's anything that you need with your bank account. We're always here to assist.