from the main menu choose multi-player then xbox live or playstation network (depends on which system you have) then choose combat training
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I don't think you can, but you can exit combat training and start it again.
yes u can
50. There is not Prestiging.
There is no bot mode in Call of Duty 4, so the only bots are in campaign. In black ops there is "Combat Training" which puts you against bots in multiplayer matches.
You got to play combat training and have your friend sign in with a different controller