The Modify Bend button can be used for modifying the geometry of bend regions.
To change the properties of a bend:
1. Unfold the bend.
2. Perform the required operation (such as Punch) on the part.
3. Optionally, you can move edges of a bend area. However, note that any bend area changed in this way will lose its bend attributes in Creo Elements/Direct Sheet Metal. When restoring such a bend, you need to completely redefine the bend.
4. Fold the unfolded bend. Specify new values as appropriate.
The Fold/Unfold button enables you to change the geometry of bends. For instance, you can use this functionality to produce a hole in a bend region. You can also use this functionality to change the bend process, inner radius, angle, and direction of a bend in a sheet metal part.