Single expense type

Dear Experts,

I have a requirement that in a tour employee has a expense type called Flight Fare. Company has booked the flight ticked for one way and in the return employee bought himself the ticket. In this case how the employee will place the "Flight Fare" expense type in the Expense report.

For ex: To ticket           - 500 USD

            From Ticket     - 600 USD, Now the expense type is "Flight Fare". What is the best way to define this?

Regards,

Narayana