Chances are that you need myIDTravel to book your staff travel tickets. It is an online portal created by Lufthansa Systems for airline employees to book their non-rev tickets. It has limited functionality to check the number of available seats on the flights you wish to travel on.
The StaffTraveler app enables you to get accurate flight loads for the flights you wish to staff travel on. Want to know what your odds are to get a seat? Download StaffTraveler and post a request for the flight you wish to take.