This dialog allows you to define the line representing ground elevation in the engineering profile view.

By default, the Elevation Data Type is set to Automatic. If you change it to Ground Elevation/Depth Curve, you can use the Station vs. Elevation table to define the ground elevation. Click the New button to add a row to the table or Delete to remove the currently highlighted row. Click the Import button to import ground elevation data from a Tab-delimited text file.