How to import 2D polylines from CAD in Solidworks ?

I am trying to import an airfoil from autocad to solidworks, but the results are just a lot of segments of lines instead of only one spline.

I did try using -> Insert Curves (x,y,z) methods. It works but the problem is when I want to create relations with any kind of elements as lines, etc.

I need an airfoil that could be sized by a center line instead of change dimensions.

Any idea ?

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If there are no sharp corners, you can select all the lines in the sketch or only those you want the spline for and us under Tools, Spline Tools, Fit Spline to create a spline.

 
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