Select an editable patch > Modify panel > Expand the editable patch in the stack display > Handle sub-object level
Select an editable patch > Modify panel > Selection rollout > Handle button
Select an editable patch > Right-click the patch > Tools 1 (upper-left) quadrant of the quad menu > Sub-objects > Handle
The Handle sub-object level in Editable Patch provides direct access to vertex handles, or vectors, without going through the Vertex sub-object level. Handles are still accessible at the Vertex sub-object level, but the Handle level provides enhanced functionality as follows:
The ability to select multiple handles for transformation and application of operations such as Patch Smooth to them.
Elimination of the possibility of inadvertently transforming vertices.
Use the Align tool for aligning handles.