Well, If you want to put some vendors on GM Island in other places, you should select them, type ".npcinfo" without the quotes, look at their name id, go where you want to put them, and type in ".addspw putcreatureidhere" again without quotes.
Ex.) .addspw 16988
I would like to know how to create Portals to places though. I put in ".addgo #portalid" and the portal was almost underground.