Display actual mileage on an invoice

Display actual mileage on an invoice

My users are creating expenses in Zoho expense. For example, they expense 10 miles and get paid 7 dollars (10 miles * IRS rate of .70). 

If I look at the expenses in Zoho Books, it does show them at 10 miles at .70 cent

When I add these expense to an invoice t, the expense comes over as a Unit of 1 with a cost of 7 dollars. 

Does any know how I can make the invoice show 10 miles at a cost of .70 for a total of 7 dollars? I can edit the line item and update it but I do not want to have to do that for hundreds of line items each week.

Thank you!