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Linking airfoil geometry to parameters and relations in catia V5

Hi, I am a 4th year Aerospace Engineering Student and my group is required to design a UAV. In my group I am responsible for designing the Horizontal Stabilizer.

I got the coordinates for the airfoil shape from an online generator and uploaded using Profscan to create a DXF file.

Anyways the final sizing of the stabilizer is not finalized, so I wanted to know if its possible to constraint the chord of the airfoil shape to certain points which I will link to a relation where i can easily change the size. If this is not possible is it possible to link the sizing of the airfoil (using the transformations tool) to a relation? when I try to size the airfoil shape it doesn't go into my specifications tree.

Please let me know how to solve my problem..

Thanks in advance for all the responses