About Mirroring Mesh Elements and Shapes
You can create symmetrical Freestyle geometry by mirroring mesh elements and shapes about a datum plane.
• Mirroring Mesh Elements—You can select a face and project it onto a mirror plane as shown in the following graphic:
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• Mirroring Shapes—You can also select the whole shape and create a new shape at a mirrored position as shown in the following graphic:
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For each shape, you can create only one mirrored shape.
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By default, the mirrored control mesh is not displayed in the graphics window and is dependent on the original mesh. Changes to the original geometry are automatically reflected in the mirrored geometry.
Click 
Dependent to activate or deactivate the dependent mode. When you deactivate the dependent mode, the mirrored control mesh is displayed. The portions of the mesh that are still unchanged can be made dependent on the original mesh. Portions of the mesh that have changed since they were made independent cannot be made dependent again.
Dependent to activate or deactivate the dependent mode. When you deactivate the dependent mode, the mirrored control mesh is displayed. The portions of the mesh that are still unchanged can be made dependent on the original mesh. Portions of the mesh that have changed since they were made independent cannot be made dependent again.Click Break Dependency to convert the mirrored shape to a regular shape, keeping the mesh structure. This permanently breaks the connection between the original shape and the mirrored shape.
You cannot mirror mesh elements in the following cases:
• You select the entire mesh for mirroring.
• Selected faces share the edges of an unselected face.
• Selected edges share the same unselected face.
• Selected edges share the same unselected edge.
• A vertex of the selected edges or faces is aligned to another plane.
You can also mirror the mesh that has edges aligned to the external geometry across the reference datum plane. The reference geometry is mirrored in such cases to retain the shape of the aligned edges. The mirrored reference appears as a ghost curve and updates as follows:
• If the mirrored geometry is independent, the ghost curve acts as a reference for moving the vertices of the edges along the mirrored side.
• If you unlink the aligned edges when the mirrored edge is dependent, the ghost curve is removed.
• For missing or failed references, the ghost curve is hidden.