How to Cut a Hole Thru ANY point on SPHERE

Hi All,

I have spherical shell that I made in Creo 2.  Now, I need to cut circular holes in the thin shell of the sphere.  How do I set up a plane(s) to draw a circle so that I can subsequently cut/extrude that circle's profile down into the spherical shell at any weird angle I desire?  In other words, I need to execute cuts not just along the X, Y and Z axes, but I need to be able to arbitrarily define my own cut directions.  Plus, those directions will need to be "tilted".

Or, is thare another way to do it?   See attachment for an idea of what I am trying to achieve.

Thanks