Create Game Session's ?!

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i try to create 100% network Game where players join the sever in the lobby scene then they can create there own Game session with there desired map how i can achieve this?

Can i lunch a server for every session from the lobby server ??
Can i create Headless version from Code? "i mean is there any special function for that or i create my own"
how i can end the session and bring the client's back to lobby ?"i saw the lobby manger but as usual the dox not very helpful"

plls Guide Tips i really appreciate it @stanchion <3

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