Use this dialog box to assign elevations when creating feature lines from objects. You can access this dialog from the Create Feature Lines dialog box.
These options override the elevations of the objects that you are converting to feature lines.
Assigns a fixed elevation to the feature line.
Creates a temporary surface from selected gradings to compute the feature line elevation. This produces the same result as selecting the grading group surface if you have not created a grading group surface.
Assigns elevations to the feature line from a surface in the drawing.
Inserts intermediate grade breaks when the entity crosses surface TIN lines, creating elevation points at these locations.