i want to make a system so that a small map is created for each key that logs in my game, i just dont know how to generate the map. i was thinking in

Have 2 dmp, one for the map of the game, other for the generated map witch will be only 18x18.
So each new key that logs in the game will have it's var hasmap changed to 1 and a new z map is created, a ID is added to key telling what z level is the key's one.
The problem is how to make 2 dmps work in one game and how to add z levels for maps(in code). thanks for the attention.