In the ordered environment, you can construct a dimple using the Dimple command. In the synchronous environment, you can construct dimples using the Dimple command or the Select tool. Both workflows are explained in this topic.
Choose Home tab→Sheet Metal group→Dimple list→Dimple button 
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Define the profile plane.
Draw a profile or copy a profile into the profile window.
Choose Home tab→Close group→Close.
Do one of the following:
If you drew a closed profile, skip to step 6.
If you drew an open profile, click to define the material side.
Click to define the extent.
Finish the feature.
Choose Home tab→Sheet Metal group→Dimple list→Dimple button .
Select the region(s) to define the dimple.
Type a value for the dimple extent or use the mouse wheel for a dynamic preview of the dimple.
(Optional) Click the handle to change the dimple direction.
Right-click to place the dimple.
Choose Home tab→Select group→Select 
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Select the region(s) to define the dimple.
Choose Home tab→Sheet Metal group→Dimple list→Dimple button .
Type a value for the dimple extent or use the mouse wheel for a dynamic preview of the dimple.
(Optional) Click the handle to change the dimple direction.
Right-click to place the dimple.