I have a component that will be manufactured using investment casting.  The feature that I'm having difficulity with is the angled slot feature located in the inner ring (occurs three places)  From the bottom the slot angles up and to the right.  The extruded cut removes material normal to the sketching plane.  I need the cut to be normal to the surface of the inner ring.  Any ideas....

The assembly of this component interlocks with a mating part that has three pins that twists and turns.

Check out the attached pic.

Thank you