Hi there, Nev.

I'd be happy to help you unreconcile past bank reconciliation so they don't throw off your records.

If you’re currently using QuickBooks Online Accountant, you can utilize the Undo reconciliation feature to unreconcile previous transactions without manually editing individual transactions from within the register. 

To undo reconciliation, here's how:

1. In the left menu, click Accounting. 
2. Go to the Reconcile tab.
3. Select History by account.
4. Choose the account you want to reconcile and set a date range from the dropdowns.
5. Find the reconciliation on the list.
6. Select View report to open the Reconciliation Report.
7. Review any discrepancies and changes your client wants to make.
8. When you’re ready, select the dropdown ▼ in the Action column, and then select Undo.
9. Select Yes and then Undo to confirm.

For more information on how to undo reconciliation, see this article: Undo a client’s reconciliation in QuickBooks Online Accountant.

If you use a different version, you can undo a reconciled statement by manually unreconciling each transaction. Let me walk you through the procedure step by step.

1. Click the Gear icon at the top.
2. Select Chart of Accounts.
3. Locate and choose the account you’re working on, and click on View Register.
4. Select the transactions you want to unreconcile.
5. Keep on clicking the R status until it shows blank or cleared (C).
6. Click on Save.
7. Choose Yes to confirm.

Before completing any of the steps, I suggest consulting with your accountant. This is to make sure that all of your records are in order.

If you run into any errors or problems while reconciling, refer to this article: Fix issues for accounts you've reconciled in the past in QuickBooks Online. 

Should you have any other questions or concerns, feel free to leave a comment below. We're always around to help. Have a great day!