Here is what I can not figure out how to do..

I have Tina a contract employee set-up as a resource.

I assign Tina to a task however the fees paid to Tina are variable for each project (no hourly rate, no cost per day, etc..).

I don't want to set-up Tina's design fees as a general cost to the task because a running total of all fees paid to Tina throughout the year is required.

Am I missing how to do this?