Mirror Entities
General Capabilities
Applies to 2D sketches and 2D sketches created on 3D sketch planes.
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Mirror to only include the new entity, or both the original and the mirrored entity.
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Mirror some or all of the sketch entities.
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Mirror about any type of line, not just a construction line.
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Mirror about edges in a drawing, part, or assembly.
When you create mirrored entities, the SolidWorks software applies a symmetric relation between each corresponding pair of sketch points (the ends of mirrored lines, the centers of arcs, and so on). If you change a mirrored entity, its mirror image also changes.
Conditions for 2D Sketches on 3D Sketch Planes
To mirror existing sketch entities:
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In an open sketch, click Mirror Entities 
(Sketch toolbar) or Tools, Sketch Tools, Mirror.
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In the PropertyManager:
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Select sketch entities for Entities to Mirror 
.
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Clear Copy to add a mirror copy of the selected entities and remove the original sketch entities.
- or -
Select Copy to include both the mirrored copy and the original sketch entities.
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Select an edge or a line to Mirror about 
.
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Click OK 
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To mirror sketch entities as you sketch them:
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Select a line or a model edge in an open sketch.
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Click Dynamic Mirror Entities 
(Sketch toolbar) or Tools, Sketch Tools, Dynamic Mirror.
Symmetry symbols appear at both ends of the line or edge.
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Create the sketch entities that you want to mirror. The entities are mirrored as you sketch them.
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To turn mirroring off, click Dynamic Mirror Entities again.