Solution for reducing mileage claim by normal home to office commute distance.

Hello,

Just wondering if anyone knows of a solution in Internet Expenses for reducing each daily mileage claim by the number of miles equal to the employee's normal home-office-home commute distance? (Our policy only reimburses business mileage over and above the employee's normal commute distance).

Of course, the employee can manually deduct this number of miles input, but if there is a way to automate this, perhaps picking the commute distance from a constant preference or DFF field value set up for each employee, that would be the icing on the cake!

Thanks

Helen.