We would like to be able to apply an administrative fee to all jobs. The way I envision this working, we would set a default amount (a percentage amount) that gets applied at the client level which would be applied to all jobs that get created (It can be overridden at a client and job level but only be people with certain security rights).
At the time of the invoice, the percentage will be applied and logged as a seperate line item on the invoice. From a database perspective, the admin fee amount and the invoice amount should and must still be stored as separate records / in separate columns so we can report against both levels.