having problem with editing roof ends

[neha27goel]

I wanted to make a roof like the one attached in picture.I did a 3d in cad, imported it in revit massing , created a mass and then created a roof form out of it. I m facing a problem with roof ends as I m unable to edit them. If i select the two cut square or two cut plumb, it says cant make the roof. Is there any other way i can do the same???
A prompt response would be appreciated.

[patricks]

well, it looks like a cube floating in 3D space, but I'm not really sure what the footprint shape is supposed to be, what the edges do, etc.

If the form is like 3 sides of a cube resting flat on 3 corners, then you can get what you want by drawing a hexagon shape in plan, and then extending 3 slope arrows in towards the center of the hexagon. To figure the slope for the arrows (or the height at head and tail), you'll have to do some trigonometry to calculate that.