Multiplayer : Add a level options while level is runing

Hello everyone,

I have a level (menu & level at the same time), and if the player click on play, the game will search for a server.
If no server are found, the game will create a session in this same level.

So I wanted to know if there is a way to add an option to a already opened level, in order to have ?listen option to my server ?

Please tell me if more details are needed.

Thanks a lot !