The Add Breaklines dialog box is closed. A message prompts you to select a polyline.
A message prompts you to specify the wall height with one value for all the points (Define By Object) or to specify values for individual points (Define By Vertex).
The prompts provide two ways to define elevations for each offset point: as an elevation (Elevation) or as the elevation difference (Delta) between the control point and the offset point. Deltas may be either positive or negative values.
The breakline is created and added to the surface Breaklines collection in the Prospector tree.