I was wondering if it was possible to just host a game for cop with a friend instead of having to using other peoples servers.
If you can open your ports in your router you can just press create server on the main menu, otherwise use Hamachi or something like that.
When all your friends join, add a password to your server so others don’t join
I would recommend doing what Darkwater said. Open your ports and go under Start Game and just make it for the number of players needed. Opening ports is super easy and is way better than using Hamachi. (In my opinion)