How do I extrude the curves off the surface normals?

Hello all!

I would like to extrude these curves off the surface to create fins but i’m currently facing difficulties.

Appreciate if you could advise on how to proceed.

Thank you! (10.1 KB)
Untitled3.3dm (39.7 KB)

HI Yu_Heng
1:First you can create a work plane
2:Then the offset curve on the plane (9.0 KB)

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thank you naruto!!!

If it doesn’t take much of your time… may i further ask how do you extrude the faces to create thickness?
Sorry I really just started out…

thank you

Like this (8.8 KB)

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Much thank you!!! I hope you reconcile with Boruto!! @603419608