This tool is used to link grids to grids or grids to terrain. The use of the tool is explained in this tutorial 1. * Select the portal tool. Image:Tut08 04.jpg 2. * Click the higher ellipsis in the Link Portals Pane. Image:Tut08 05.jpg 3. * Select the portal at the cave entrance in the cliff on the terrain region. You will not be selecting the object itself, but the actual hole inside of the object. Image:Tut08 06.jpg You will notice a Portal number appear in the field next to the ellipsis. 4. * Click the lower ellipsis in the Link Portals Pane. Image:Tut08 07.jpg 5. * Click on the plane on the open end of the entrance feature in the cave on the grid region. Rotate the camera so you are inside the cave, looking at the entrance feature.