Question about using my CSR instead of my GTCC

Hey all,

I am leaving for a course in a few months and I want to try and book the flight on my CSR instead of my GTCC for the points I would get. I know it might not technically be the correct thing to do, but I also know a lot of people do it so I am looking for advice on the best way to make sure I get reimbursed for the flight and be able pocket these free points.

What's the best way to do this?