Insert Objects into DXF

I already have the base DXF drawn and simply need additional shapes placed into it. The task is limited to adding new objects only— no deletions or edits to what is there now. Here is the workflow I... (Budget: $10 - $30 AUD, Jobs: 3D Design, 3D Drafting, 3D Modelling, 3D Rendering, AutoCAD, CAD/CAM, Engineering, Solidworks)