AutoCAD Civil 3D

[#1]

hi

I have a featureline as the top of a wall and want to grade up away from it to marry to existing ground

I think I have seen it done before with grading but can not remember now any suggestions. 

[#2]

This is a slope from the top of wall up (or down) to the existing surface - correct?

Create a grading object using a slope to surface criteria, and add a surface to the grading group if you need to paste it into a composite FG surface.