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Creating a hole with only 1 surface instead of two halves

Creating a hole with only 1 surface instead of two halves

When creating a solid hole in Creo (or Pro/ENGINEER) the system will generate a cilinder that consists of two separate halves. Why?

The problem is, when exporting to STEP or IGES or whatever format, these holes are also exported as separate halves. When exporting is done in order to import it into a CAM solution other than Creo, this creates a problem.

When creating a cilindrical extruded surface, the system generates only 1 surface instead of two. Why then creating 2 halves when extruding as a solid???

It would make sense if holes are generated as 1 surface, instead of two.