With this FREE AutoCAD add-on you can create terrain sections
from geodetic points(heights) in the drawing. You can also
specify position of pipe(cable, road, ...) or set auxiliary
marks in the section.
Text settings, scale in X,Y axis, height of the reference
plane and type of the terrain section can be set at start-up.

There are two ways how you can create terrain sections:

1) Terrain section from known X,Y coordinates

Enter values for X,Y coordinates, specify marks
position and terrain section is drawn in real time
as you type values.

2) Terrain section from the drawing with geodetic heights

Specify points on-screen and type 'Y' if you want to enter
Y-coordinate(terrain height). You can also specify marks
position or use 'Interpolate' option to calculate terrain
height from two near terrain heights.
Terrain section will then be created in a new drawing.