Each journey should be accounted for as a line on the invoice as follows. You can do one journey per invoice or multiple journeys per invoices, it’s up to you.
Add each journey on a separate line. Be sure to state the following details in the description field.
The reason for the journey
The date of the journey
The number of miles travelled
The rate reclaimed (e.g. 45p). Refer to the current HMRC rates for approved mileage.
Any corresponding transactions get logged as payments to the invoice from the DLA or employee loan account.
You could set each employee up as a supplier but this is not necessary, you’re already able to deduce individual supplier expenses by reference their corresponding loan account.
The concept of logging expenses for mileage or otherwise is the same in QuickFile and most other accounting systems. The allowable part of the expense is logged into QuickFile on an invoice then paid from the employee or director’s loan account.