Moving Objects Symmetrically About a Virtual Mirror Plane

  1. Select two or more objects.
  2. Click the Move tool.
  3. Click Symmetric Movein the Move options panel.
  4. Click one of the translation arrows and drag. As you drag, a ghost mirror plane appears at the center of the Move handle, perpendicular to the direction you are dragging. Movements are mirrored about this plane. A ghost move handle is displayed on the other side of the virtual mirror plane to indicate the mirrored translation or rotation. Selected objects are moved symmetrically about the indicated plane.
    To reset the virtual mirror plane, change selection or toggle the Symmetric Move option.

Example:
Moving two solids symmetrically about a virtual mirror.
Moving two curves.