This is a post by Mike Gayette on PTC site.
Creating features from sketches can take time. But with Creo, you can now create that same geometry in seconds with Sketch Region selection.
Creating geometry from sketch regions reduces the need to perform Project and Trim operations within Sketcher. It also offers a flexible way to use parts of a single sketch as the basis for several sketch-based features.
Version: Creo 5.0
Extension: No extension needed.