Create advanced wall types using the ellipse or partial ellipse tools in the Draw area.
You can add elliptical walls and elliptical curtain walls to a model. Sketch elliptical walls using the ellipse or partial ellipse draw tools in the Modify Walls | Place Walls Draw panel.
You can create and modify elliptical walls in much the same way as linear walls, with a few exceptions, as listed in Best Practices: Elliptical Walls.