In this exercise, you will create a third section using both the existing ground (EG) and finished ground (FG) surfaces.

1. Zoom to the previous view.

2. On the Terrain menu, click Sections Multiple Surfaces On/Off and verify that "Multiple surfaces are on" is displayed at the command line.

3. On the Terrain menu, click Sections Define Multiple Surfaces to display the Multiple Surface Selection dialog box.

4. From the Select from list, select EG, hold down the CTRL key, and then select FG.

5. Verify the EG and FG are displayed in the Current list, and then click OK.

   Use the following steps to specify line CC as the third section line.

6. From the Terrain menu, click Sections Define Sections.

7. Enter SE-NW for the Group Label and CC for the Section Label.

8. Use an Endpoint Osnap to select the upper end of line CC, and then use an Endpoint Osnap to select the lower end of line CC.

9. Press ENTER twice.

   Next, process the section.

10. From the Terrain menu, click Sections Process Sections.

11. Press ENTER to accept the default, Yes, to append to the end of the existing section file.

12. Enter SE-NW for the Group to retrieve, and then press ENTER.