I am a new  DraftSight user with only a few days of experience.  I am using a program called Auto DWG PDF to DWG Converter which claims to convert pdf files to editable dwg files.  When I attempt to edit the drawings, I find that I can add lines but if I try to move or delete lines of the original drawing, it behaves as a single entity.  I can delete or move the whole drawing but not parts of it.  Does anyone have any experience with this problem and knowledge of a solution?