In Graal Editor, open one of the levels, then create an NPC with
PHP Code:
loadmap mygmapname;
then delete it after it has loaded.
To upload it to the server, add the GMAP name (without extension) to
gmaps= in server options. Make sure the GMAP file is both a file and level in folder config, then warp to the GMAP name.
If these don't work, give more information about how it isn't working (do they show as single levels, does it say the GMAP doesn't exist, etc.)