I have entered some expenses in error.How do I back them out as if it never happened. ?

Hello there, @snicloff. I'm here to assist you with deleting expenses from your records in QuickBooks Online.
 

To get started, could you please confirm whether these expenses were added recently or have they already been reconciled? If the transactions were recently added, you can remove them by following these steps:  

1. Go to the Expenses tab.
2. Locate the expense that was entered incorrectly.
3. Click on the expense to open up the transaction details.
   
   

    

4. In the "Expense" screen, click on More at the bottom.
5. Choose Delete.
6. Confirm your choice by clicking the Delete button.
   
   

    

For more detailed information, feel free to check out this article: Void or delete transactions in QuickBooks Online.
 

Additionally, it’s important to ensure all your entries, whether they are automatically downloaded or manually recorded into QuickBooks, are accurately categorized to avoid discrepancies in the future.
 

Please let me know if you need further guidance on deleting the expenses or if there's anything else you need help with. My team and I are always here to help you. Wishing you a great day ahead!