Imported DXF files push pull not an options

I have imported a dxf file into sketchup pro, I want to give it a dimension however the push pull optional is not available.
Any suggestions?

Most likely there are no faces in the imported DXF file to extrude with Push/Pull. You would first need to create faces. Depending on the way the .dxf file is created, you may be able to simply open the component in SketchUp and trace edges with the Line tool to get faces to form.