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