How to delete established mileage categories in QBSE

Thanks for posting your concern here, @rob-latimer-righ.

I'm here to guide you delete your some of your mileage. 

You can follow these steps:

1. Go to the Miles in the left panel.

2. Click the dropdown arrow beside the Add trip tab to select the transactions you'll want to delete.

3. Tap Manage Mileage Rules

4. Choose the mileage that you want to delete.

5. Click delete.

I’ve got an article with detailed troubleshooting steps when encountering problems with tracking miles below:

• Fix mileage tracking issues in QuickBooks Self-Employed for Android
• Fix mileage tracking issues in QuickBooks Self-Employed for iOS

Let me add this article as a future reference: Automatically track mileage in QuickBooks Self-Employed.

Keep me posted if you need anything else in QBSE. Just leave a comment below and I'll be sure to answer them. Take care always.