The Element sub-object level is essential when you are Shift+cloning and Shift+extruding patches, because doing so creates separate elements. For example, if you select a patch, hold down the key, and move the patch to a new location, a new element is created separate from the original. This also applies to extrusion. If you hold the key down while you extrude, a new element is created.
For information on the controls in this rollout, see Selection Rollout (Editable Patch).
See Soft Selection Rollout for information on the Soft Selection rollout settings.
See Geometry Rollout (Patch) for detailed descriptions of these controls.