How can I back out about 10 client payments that I accidentally batch-accepted?

Hi there, rebecca71. 

I'll make sure you'll be able to move the payments back to where they were before in QuickBooks Online (QBO). 

We can simply go back to the banking page and undo the transactions from there. Let me show you how:

1. Go to the Banking menu.
2. Choose the tile for the bank or credit card account you downloaded the transaction.
3. Click the Categorized tab.
4. Put a checkmark on the transactions you want to unmatch
5. Lastly, click the Undo option.

These transactions will then be moved back to the For Review section. 

I'm also adding these great articles that you can check for additional reference about organizing transactions in QBO:

• Assign, categorize, edit, and add your downloaded banking transactions
• Exclude expenses from downloaded bank transactions

Also, I've attached this article that can help guide you in reconciling your accounts in your QuickBooks Online (QBO) account: Reconcile Accounts in QuickBooks Online.

Keep your post coming if you need more help undoing transactions in QBO. I'm always here to help. Have a good one!