I would open the dxf file using solid edge.
Click open file, and navigate to the dxf file.
Select the file, and click open.
You will be prompted to select a template to use.
You will need to use the draft template.
Your dxf should open as a 2d drawing, after SE converts it.
Now, you can window the drawing, and select copy.
Finally, open a new part file, and select the sketch command.
Select the plane you wish to place the sketch upon.
Click on paste, and you should have pasted the sketch to that plane.
You can use the move command to reposition the sketch.
-av8errr
Solid Edge ST3
xw46003GB
RAM2Quad CPU
3.00GHz