How to add a new warp portal

[Jimmermania 24]

Hello guys, im searching the way to make a portal, warp portal.

This portal already exist at a map, but not like an npc. Just at the design of the map.

 

What i have to do, to make this portal work?

I create a new npc? like 10051 (its an existing portal) and i change the number next to the name to x,y of my portal? 

Then? how i make this portal warp me somewhere else?

 

Thanks a lot.