Creating a System with one of the axis normal to surface.

Hi all, my name is Lucas.

I have met a problem with creating the system with one of the axis normal to particular surface. Basicaly imagine that you have a 'lips' and on the edge of it you want to creat a System with one axis normal to the curved surface? I vas trying several option but I have failed. Maybe someone over here have similar task, and was able to do it?

Regards,