[Wizzardoff]

Im new to csgo hosting so i just wanted some clearance . Does file gamemode_server.txt completely replace gamemode.txt when active (it deactivates gamemodes.txt) or just some commands inside gamemode_server.txt which override commands in gamemodes.txt?
I assume just some command overriding as gamemodes.txt had a lost more code inside. Im asking because i just want to make an active mapgroup in gamemodes_server.txt and all the rest leave in gamemodes.txt which probably will be replaced with default gamemodes.txt after server update.
Thanks