Hello everyone!

I don't have alot of modding but I'm trying to learn and I've been poking around mod tools trying to see if a concept I have is possible but I'm not sure where to start I was hoping I could get some advice! So I was wondering if it's possible to alter the contents of a maps round, for example when you load the mod you can set it so it's only dog rounds or something. I'm not sure if a game mode can be loaded in the main menu that could effect all maps or if this would have to specifically alter a map to get it working. Thanks for reading!