Catia V5: How to draw airfoil, using law & parallel curve?

Hi,
I have no problem when it comes to draw a curve with one input and one output variable (ex: F(x)), but I am getting trouble when attempting at drawing airfoil, where each coordinate depends on other parameter.

I'd like to avoid using the import excel macro, because I want an efficient way to iterate shape should I need to change them.

If possible I prefer using the law and parallel curve feature in Catia V5.