Need to make a "widow's walk" on roof

[susain]

I need to do a roof that isn't quite what the program offers. I don't know what it's called, but it slants up equally from each of four walls, then has a small flat square on top with a railing around it. The automatic roof (hip roof?) has a "seam" along the top. Is there any way to do this manually in HD Suite 7? I'm using a 12 pitch; have four dormers in place extending from a 3rd floor/attic; and have a different pitch over a curved bay front room.