Hello there, @rich30.

Deleting an unbilled activity in QuickBooks Online can be done in just a few clicks. You've got me here on how to accomplish this.

To eliminate the unbilled 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.

I'm also adding here a link about creating an invoice for unbilled time activity in case you need it in the future: Automatically Invoice Unbilled Time Activities.

You can also visit these resources below to learn more about entering single and weekly time-sheets in QBO:

• 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!