I think the easiest way is to set up the employee as a supplier. I prefix my employees' account ref with ZZ to keep them together at the end of the list. I process my receipts through AutoEntry.

Otherwise, process the payments dated the day of the payment with the same reference, If you set bank defaults to group transactions in bank red, the individual lines will get summarised when you do the bank rec.

The only problems with this approach are:

1. Cant store images of the receipts
2. The expense item is not booked into Sage on the date it is incurred