Changing an Edge Relief Type and Dimensions
- Select an edge or face of a relief.  You can Ctrl+click to select multiple reliefs. 
- Select an option from the Edge Relief tool in the Modify ribbon group on the
                        Sheet Metal tab.You can also select a relief type from the mini-toolbar or modify the Bend Relief Type in the Sheet Metal section in the Properties panel. Depending on the relief type, you can also modify: - Bend Relief Width: The width of the relief is A in the images below.
- Bend Relief Depth: The depth of the relief is B in the images below. 
   