Hey guys hope someone can help with this

Been a while since i used bobcad but i imported a STEP file and need to get it on the right view and make it a dxf so that my other software can read it. I can get it to the right view but after that no mater what i try i cant get it to select anything . i just need the outside perimeter of the the drawing. I dont need the 3d but only a 2d and saved to dxf and i cant get it to work. any help will be appreciated .