How set up multi sessions on dedicated server

Hi !
First time using UE answerhub, so sorry if I made mistakes.

For my school porject, i’m trying to create a simple 1v1 fps online. I already have my dedicated server, but now I need to create several sessions in order to allows players to connect and play, without them being 6 on the same map.
I.E. : if i got 6 players, i want 3 sessions game (map) with 2 player in each one.
Furthermore, players are only clients.

I already check some idea, like using port, but i’m new using server stuff, so I don’t realy undersand all ^^’

Some clue to help me ?