To Export Geometry to a SketchUp (.skp) File

Open the model to be exported.
Select File > Export > 3D Modeling File Types > SketchUp (*.skp) .
The SketchUp (SKP) Export dialog opens.
Adjust settings as required.
Click Export.
The Create SketchUp File dialog opens. The default filename is that of the DGN file, but with an .skp extension.
Use controls in the dialog to select a folder and, optionally, change the file name.
Click Save.