Hi there, John180.
 

I'll guide you through how to delete an estimate in QuickBooks Online. Here's how:
1. In the navigation bar on the left, go to Sales, then open your All Sales tab.
2. Locate and click on the one that needs to be removed. Use the Filter button and/or other sorting options if necessary.
3. Hit More.
4. Select Delete.
5. Choose Yes.

The record will now be deleted from your books.

Here's a resource about using estimates which might come in handy: How to Send Estimates, Quotes, & Proposals

If you have any other questions, feel free to respond in this thread. I'll be here to help. Enjoy the rest of your day!