You certainly should not shear every corner in a design. The idea is that you have bend relief notches. There are some options in Creo to do this. I normally just extend the bend beyond that edge. In general, I am not overly happy with the interface and performance of how bend relief's are managed in the Sheetmetal package but it works for many. I try to detail it to what is -actually- done by the shop.
You can also "extrude" cut the small remainder if you prefer. Just make sure that you can still "unbend" or "flat pattern" a part once you perform a non-sheetmetal operation. Some operation that happened near a bend line feature could make the unbend/unfold operations fail.
