Using the new Mirror command for curves in Style, you can mirror a Style curve across a datum plane.

User Interface Location: Click Model > Style and then select Curve > Mirror.

Release: Creo Parametric 5.0.0.0

You can also watch this video on the PTC Learning Connector: Creating Mirror Curves in Style

You can create a mirror of Style curves without leaving Style. You can do this for any type of Style curve across a datum plane, that will be used as the mirror plane. You can mirror a single curve or multiple curves at one time and the resulting mirror curves appear as a Style mirror feature in the in the Style Tree

The Mirror curves are dependent on the original Style curve. You can only modify the original Style curve. However, when the shape of the original curve is changed, the mirror curve dynamically updates.

You can break the dependency of the Mirror feature if you convert the mirrored curves to free curves.