This is a Pro only feature.
The AutoCAD Export Options dialog box contains options for exporting AutoCAD files.
AutoCAD Version
The AutoCAD section of the AutoCAD DWG/DXF Export Options dialog box is used to select the version of exported DWG/DXF file.
Export
The Export section of the AutoCAD Export Options dialog box contains the various entities that can be exported into your DWG/DXF file.
SketchUp can export faces, edges (wires), dimensions, text, or guides in any combination.