This is from google. Just did it in case your results were constrained somehow... selecting objects in the tree (#4) is a key point...
1. Open Draft Workbench: View->Workbench->Draft.
2. Create a new file.
3.Import your DXF: File->Import.
4. Select all necesarry objects in Tree view (you can use Ctrl or Shift to select many objects)
5. Use a tool Draft->Draft to Sketch.
you have a new, automatically constrained sketch (see Tree view)
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