How do I attach mileage to an exist expense?

It's my pleasure to address your concern for today, raygorb-gmail-co.

I can help you perform the next step after creating expenses so you can track mileage to them.

Once you set up a mileage expense account, you'll want to create a bill to track mileage. I'll show you how below:

1. Go to the + New icon.
2. Select Bill.
   
3. Fill in the necessary information such as the Supplier, Category, and the Amount.
4. Select Save and close.

To know more about how the Mileage tracking feature works including the steps on how to automatically track your mileage in QBO, see this article:

• Automatically track mileage in QuickBooks Online
• Set up mileage tracking and vehicles in QuickBooks Online
  

I'm just around the corner if you have any other QuickBooks mileage concerns. I'm always willing to lend you a hand so you can achieve your goals. Have a good one.