Reversing grid and multi-race options

Apologies if this is common knowledge, or frequently asked, but my dumb ass can't figure this out after hours of googling and reading srs files.

I've been running an F3 season with Multi-races and wasn't able to set up 2 separate quali sessions so I jus ran with the reverse grids depsite that not matching the real life rules.

Now I'm trying to run a GP2 series but I cant figure out how to just reverse the top 8? I'd also like to know how to make race 2 different lap count from race 1?

Many thanks