Remove All From ShooterGame?

Hello, I am wanting to use the base of the ShooterGame just the character, bots, and weapon system as the base for my game. Is there a way to remove all the other stuff, game modes, and menus? I have all my own stuff for that, just need my base character to be in c++. I can get 80 of them in a map vs blueprint where I can barley get 40 in a map. Any help would be great!