Reverse slope on slope surface

[MalikUmair]

Hi i want to create sections of concrete key structure. I am creating Feature lines in civil 3d but the surface created from Feature lines does not go from Point A to B then Point B to C (as in section on left picture attached) the surface goes from Point A to C then Point C to B (as in right side shape in picture)

[Joe-Bouza]

Civil3d surface is not like a part model surface. You cannot have a common xy have two z values . point c must have a slight batter outside (to the right) of B & A. ditto for the left side

[tcorey]

In case you were wondering what @Joe-Bouza 's note means. NFG. No F-ing Good. 

[Joe-Bouza]

Nice Friendly Greeting (lol)

[MalikUmair · Accepted solution]

Thanks for your reply and sorry for late response. I had solved my problem by creating 2 feature line groups and 2 surfaces from them by placing feature line at exact position and adding both surfaces to section view and computed material base on sub criteria.