To Unfold Sheet Metal Features
You unfold sheet metal features relative to a plane at the end of the material, or unfold bends or rolls relative to a face.
Important: The unfold command requires a single body in a part file. If the part file contains multiple solid bodies, use Make Components or Make Part to export the bodies to a unique part file. Open the new part file to unfold the part.
On the ribbon, click Sheet Metal tab
Modify panel Unfold 
.Do one of the following:
- For sheet metal bends or rolls relative to a face, click a face or plane to use as the unfold reference.
- For rolled sheet metal features relative to a plane at the end of the rolled material, click a temporary plane at either end to use as the unfold reference.
Select highlighted bends or rolls to unfold.
Preview the flattened state, and add or delete bends or rolls to obtain the desired flat.
Click the Sketches arrow, and select any unconsumed sketches to unfold.
(Optional) To display the parent sketch for bends or rolls relative to a face that has a sketch, select Parent is Visible.