How do you shift an edge in the direction of inclination of the face to which it belongs?

Hi all;

I am trying to shift an edge in a parallel way in the same direction of the surface (or its support) 

Do you have an idea please? 

Thank you in advance

Kind regards

Hello

Under GSD the Parallel Curve command (on the other hand it may be necessary depending on what you have as a parent surface to create before the extrapolation of the surface that will serve as a support.

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Thank you Franck