Updating a Variable from a Field

I'm creating a calculated field to calculate freight rates based on a fuel surcharge inside a module I call "Freight Rates".  Essentially, I need a place that an employee can enter the price of fuel once and it will automatically calculate all of the rates in the "Freight Rate" module.  Any suggestions on where I can place that field?  The only thing I can think of is placing the field on the record and use a mass update to change them all, but I'm guessing we will end up with 10,000 records that need updated weekly.  Thanks in advance for any suggestions.

Parents Reply Children
No Data