Is there a way to delete a game that I have going in the Multiplayer "My Matches" ?

Thank you for the dummy version of multiplayer. How does a friend and I play a scenario we each own. Say from the Red Storm campaign? I'd love to also maybe set-up some custom scenarios. I'm a long time Combat Mission (1) player and like OOB. Also, how do we save a multiplayer game in progress, if w...