WISH: extrude surface normal to srf

As for the extrude curve (command “Fin”), it would make sense to add an extrusion of a surface normal to the srf. For example, I want the surface portion (alpha) is extruded in the direction normal to the entire surface.
It makes sense to ask this?

How would this be different than the Fin command?

I think doing a surface offset with the solid option enabled should do this? (if I understand correctly…)

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Yes , split + offset solid.

Perfect Cyver, you are fantastic!

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