In sketch mode, specify properties for parallel boundary lines to create a sloped surface.
You can use this method to create a sloped surface on the following types of elements:
To create a sloped roof, see Roof Slope.
To slope a building pad, see Create a Sloped Surface Using a Slope Arrow.
To create a sloped surface
 Mode panel
Mode panel
 (Edit Boundary/Footprint/Sketch).
(Edit Boundary/Footprint/Sketch).  and Offset From Base
 and Offset From Base  .
.  and Offset From Base
 and Offset From Base  .
. 
 (Finish Edit Mode).
(Finish Edit Mode). To see the resulting sloped surface, open a 3D view or a section view.