Place Curtain Wall Dialog Box: Floor Plan and 3D Window

Enter top and bottom elevation values of the Curtain Wall. From the pop-up, choose one of four Reference Levels for defining both top and bottom elevation values (Current Story (in Floor Plan) To Reference Line (in 3D Window), Project Zero, any other Reference Level.)
Enter the total height of the Curtain Wall measured from top of Curtain Wall. Use the pop-up to define the origin from which to measure the top height value.
Enter the total height of the Curtain Wall measured from bottom of Curtain Wall. Use the pop-up to define the origin from which to measure the bottom height value.
Enter a slant angle for the Curtain Wall: the angle between the input plane and the Base Surface at its inner side.
Note: This field is gray for a curved Curtain Wall, which is always vertical.