Games : trying to tp members in a certain team in minecraft

I am creating a server in minecraft and I would like to make it when a player gets to a certain area it teleports the members of a certain team to a different location and would all so like to know how to separate different areas for commands in different worlds so say u use a command block in one world it will not effect anyone in the other worlds and also how if possible to set it so u can have different games in the same world but none of the commands will work from one game to the other please help