Contours can be edited with AutoCAD TRIM, EXTEND, BREAK, and ERASE commands. If the contour style has grips enabled, contours can also be modified using standard grip editing commands.

In this exercise, you will trim and extend contours to keep them inside a fenced area. Use the white polyline on layer 0 (zero) as the boundary.

1. Click the Layers icon and thaw layer 0.

2. On the View menu, click Named Views to display the View dialog box. Under Name, select 2, click Set Current, and then click OK.

3. Enter TRIM, select the boundary polyline, and then press ENTER.

4. Select the contours to trim and then press ENTER.

5. Enter EXTEND, select the boundary polyline, and then press ENTER.

6. Select the contours to extend, and then press ENTER.

Click here to see an illustration of the edited contours.

This concludes the contour creation lesson. In the next lesson, you'll learn about generating sections.