To Mirror Curves in Style
You can mirror curves while the Style tab is open.
1. Perform one of the following actions:
◦ Action-object
a. Click the arrow next to Curve, and then click 
Mirror. The Mirror tab opens.
Mirror. The Mirror tab opens.b. Select a curve or curves to mirror.
◦ Object-action
Click a curve or curves to mirror, and then click Mirror on the mini toolbar. The Mirror tab opens.
Mirror on the mini toolbar. The Mirror tab opens.The number of selected curves appears in the 
Curves collector. The curves appear in the Curves collector on the References tab.
Curves collector. The curves appear in the Curves collector on the References tab.2. Click the 
Mirror plane collector or the Plane collector on the References tab to activate it, and then select a datum plane to use as the mirror plane.
Mirror plane collector or the Plane collector on the References tab to activate it, and then select a datum plane to use as the mirror plane.3. Click 
OK. A mirror of the selected curves appears, and a Mirror feature appears in the Model Tree.
OK. A mirror of the selected curves appears, and a Mirror feature appears in the Model Tree.