Here is my problem: I have a part started as SheetMetal and I've made a Cut-Extrude, using a Block for sketch. I've edited several times the sketch and changed the Block. Lately, I've seen under the sketch several "DerivedBend". I don't know what is this, I can Supress them but not to Delete. Why they've appeared and how can I get rid of them?
Here is an image and I've also attached the part.
Thank you all.