Glad to see you here in the Community, @debbie-mylius.

I'm here to walk you through on how to delete or edit a single time activity in QuickBooks Online.

If you're referring to deleting or editing an employee's time activity, you may select the time-sheet row to display the details and make the modifications or select Delete at the bottom.

However, if you mean to eliminate the single time activity for your customers, please follow these steps below:

1. Click on Reports.
2. Choose All Reports.
3. Hit on Review Sales.
4. Press on Unbilled Charges or Unbilled Time.
5. Tick on the Charge, and click on More then Delete.
6. If it’s a Time Charge, just click on it Delete.

To edit them, just select the time-sheet of the customer and make the changes from there. Click on Save once you're done.

For more details about entering single and weekly time-sheets in QBO, you may check out these links below:

• Enter a single time activity timesheet
• Enter a weekly timesheet

Let me know if you have any other questions. I'll be around to help. Have a nice day!