Mirror PropertyManager

To open the Mirror PropertyManager:

In an open sketch, click Mirror Entities Tool_Mirror_Entities_Sketch.gif (Sketch toolbar) or Tools > Sketch Tools > Mirror.

Options

Tool_Mirror_Entities_Sketch.gif Entities to mirror Select some or all entities to mirror.
  Copy Select Copy to include both the original and mirrored entities. Clear Copy to include only the mirrored entities.
PM_mirror_about.gif Mirror about Select any line, the linear edge on a model, or the linear edge on a drawing about which to mirror.