Draw an axis through a point, normal to a surface

And the point is not on the surface.

I'm looking for a solution to do this in Creo Parametric 2.0, it's to measure an angle I need to create another part.

I don't care the angle can be defined the sketcher environment or as a measurement feature, the most important thing is to get this angle.

The point is on a surface through the center of the revolved surface. The surface can be hemispherical, ellipsoidal or torispherical. (it's a pressure vessel head).

Thanks!

Jeroen.