How do I undo a previous month's bank reconciliation without access to an "undo" button. The online version is a little different than the desktop version. Help?

I have all the steps to undo your reconciliation, @dennis57.

You can only unreconcile one transaction at a time in QuickBooks Online (QBO). Only accountant users have the privilege to undo multiple reconciliations using their QuickBooks Online Accountant (QBOA). If you're the only one who manages the books, don't worry. You can sign up for QBOA for free. All you have to do is to send an invite to your email address.

Follow these steps to invite yourself or your accountant:

1. Sign in to QBO as a primary admin.
2. Go to the Gear icon and then Manage users.
3. Under the Accounting firms tab, select Invite.
4. Enter your accountant's info or yours.
5. Hit Save.

After that, open the invite email and select the Accept Invitation link. Follow the steps to create an account or connect. Once done, here are the instructions to undo the previous reconciliations:

1. Sign in to QBOA.
2. Find and open your QBO company.
3. Go to the Accounting menu and then the Reconcile tab.
4. Click the History by account link.
   
5. Select the account and date range from the dropdowns.
   
6. Find the reconciliation on the list.
7. Select View report to open the Reconciliation Report.
8. When you’re ready, select the dropdown under the Action column, and then Undo.
9. Hit Yes and then Undo to confirm.

If you prefer to do it manually, follow these instructions to undo reconciled transactions one at a time:

1. Go to the Accounting menu. Then select Chart of Accounts.
2. Find the account and select View register.
3. To help you focus on this task, filter the register to only include the last 60 days of transactions.
4. Review the check column. If the transaction is reconciled, you’ll see an “R.”
5. Select the box and keep clicking it until it's blank. It removes the transaction from the reconciliation.
   
6. Select Save. Then close your register.

Finally, if there are any discrepancies, check out this article to help you resolve them: Fix Issues When You're Reconciling Accounts.
 

Please come back if you need any further assistance with this process. The Community is always here to help.