Extrude Cut Holes

I looked for a discussion that would help me answer my question, but could not find one that was similar to what I need. I have a curved plate and I need to cut 3 holes on top and 3 on the bottom. I'm using extrude cut to create this holes, but the holes are extruded straight, thus makes the side holes at an angle. What I want are the holes to follow the curvature of the part. Any suggestions? Thank you.

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