You can use the imprint tool to create a dimple effect as in sheet metal.
- Start with a solid object with one or more profiles on one facet. Activate Imprint and select the facet that will be imprinted.
- Select the Dimple sheet metal option.
- Select a closed profile.
The height must be a negative value greater than the sheet thickness. The top radius must be equal to or greater than the thickness of the sheet.