I had someone ask me a question about how to transfer a hole pattern from one curved surface to another.

The situation consists of two separate parts.

The first part is a square shape that has a circular cutout on one side with a flange that contains holes.

The second part is just a round pipe, and the intent is to bolt the square shape to the round pipe via the flange on the square shape.

The holes need to be transferred from the flange on the square shape to the round pipe.

Does this need to happen in an assembly, or is there a way to transfer hole patterns between to separate round surfaces of two separate parts?

Thanks