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Good afternoon, @MaryJo1459! Happy to have you here in the Community. Let's take a look at the options you have for undoing a bank reconciliation.
If you have an accountant that uses Quickbooks, they can easily undo a reconcile for any account in your Chart of Accounts. If you don't have one, you also have the option of undoing each transaction until it's cleared. Here's how:
You would continue to do this for all the transactions you need, or for every transaction if you want to unreconciled the whole account. Here's a helpful article on undoing reconciliations: Undo or remove transactions from reconciliations in QuickBooks Online.
If you need to re-enter that transaction go to +New in your account and add in the transaction (make sure you put in the right date, etc) and it will then show up in your register.
Any questions you have, please reach out through this post and we can help you.