To Export a Drawing to a 3D DWF File

Verify that the drawing’s Model tab is selected.
At the command line, enter UCS, and then enter World.
Click ExportOther Formats.
In the Files of Type drop-down, click 3D DWF, enter a filename, and specify a path, if necessary.
The .dwf extension for the file name is specified by default.
Optionally, click ToolsOptions and modify the publishing options. For more information, see Civil 3D DWF Publishing Options dialog box.
Click OK to close the DWF Publishing Options dialog box and click Save to generate the DWF file.