QuickBooks Self-Employed offers a feature to track mileage in your
mobile app automatically, Gret.
Here’s how to turn it on:
This automatically detect your starting and stopping
locations when you're driving for all of your trips.
If you prefer to track this manually, you might want to
check this article for additional details: Manually add mileage in
the mobile app.
Please let me know in the comments below if you need