Importing 3D DXF into 2D Sketch

Hello All,

   I have a 3D DXF file that I really only want the 2D sketch of the outline (perimeter) of the bottom view. When I import it into solidworks I have the bottom view I want. My final goal is to extrude it into a surface. I am very new to Solidworks and not sure what to do next.

Thank you

Josa

SolidworksImport export