About Creating a Cropped Surface

Use the Create Cropped Surface command to create a surface that is a copy of a polygonal area of a source surface.

Each cropped area becomes a separate surface object (a new surface) that you can manage and manipulate.

When you create a surface by cropping the source surface, or when you rebuild the new surface, Autodesk Civil 3D creates a copy from the saved version of the source surface. If you modify the source surface and want the changes to be reflected in the new surface, save the drawing containing the source surface before you rebuild the new surface.

Note: When a new surface is created, Autodesk Civil 3D takes a snapshot of the new surface. To rebuild the new surface, you must first perform the Rebuild Snapshot command and then the Rebuild command.