Create Portal( Forgotten Realms Campaign Setting, p. 34)
You have learned the ancient craft of creating a portal, a permanent magic device that that instantaneously transports those who know its secrets from one locale to another. Faerun is riddled with portals.
Craft Wondrous Item (PH) ,
You can create any portal whose prerequisites you meet.
Crafting a portal takes one day for each 1,000 gp in its base price. To craft a portal, you must spend 1/25 of its base price in XP and use up raw materials costing half of this base price. See Chapter 2: Magic for details of portal creation. Some portals incur extra costs in material components or XP as noted in their descriptions. These costs are in addition to those derived from the portals base price.