Hi nd5,
Welcome to the QuickBooks community. I know many businesses need to track mileage for various reasons and important to make sure it's in your books. I'll help you sort this out in your version of QuickBooks.
I see from the tag you've chosen for this question that you're using QuickBooks Online. The mileage tracking feature isn't available in that version of the program at this time. We know many users would love to see this feature and it's something that our product development team is working on. In the meantime, here's an article that explains how to track mileage in QuickBooks Online.
Mileage tracking is currently available in QuickBooks Self-Employed. I encourage you to evaluate both products and go with the one that works best for you. Just note that information cannot be transferred between Online and Self-Employed as they are different products. Learn more about all versions of QuickBooks here: All QuickBooks Products
Let me know if you have more questions!
