I understand the importance to be able to reimburse your employees for any costs they incur as they conduct their daily duties. You'd want to set up a mileage reimbursement pay type in QuickBooks. I can guide you on how to do this.
Navigate to the Payroll or Workers menu.
Select the Employees tab.
Double-click on the employee's name.
From the How much do you pay section, click the pencil icon next to Add additional pay types.
Choose Even more ways to pay drop-down.
Place a checkmark next to Reimbursement.
You may enter a recurring amount in the box, or add it when you run payroll.
I got mileage to work as a non-taxable reimbursement but there is nowhere to record the HST portion. I could record it separately but qbo forces me to put all reimbursements to the same account so I have to go in with a journal entry later to pull the hst out.