Process, there is no form. Write a letter to:
Brandy Reaves
Public Information Specialist, FOIA
bareaves@fcps.edu
571-423-1223
Be specific and avoid asking for years of data. For example, ask for detailed travel expenses for X from date Y to Y. Do you want travel expenses for attending conferences, meetings out of state, etc., and not for local travel. Do you want cost of conference or meeting, room, food, taxi, airfare, etc?
You will probably get a response saying that the response will take longer than Z. They might try to stick you with a cost for doing the research. Why you want to be specific is that you do not want staff to take a lot of time collecting data, organizing data, etc. This is the cost factor.
However, the request is not out of line and surely, a 2.3 billion dollar corporation has those data sheets handy. Good luck and please post.