Use symmetric mode in Subdivision Modeling
When creating a model that has symmetry, you can start symmetry mode and work on one side of the model, letting the system mirror your modifications to the opposite side.
Symmetric modeling workflow
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Select the Home tab→Symmetry group→Start Symmetry command
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Identify a plane or face as the source of symmetry.

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You can place the mirror plane on the opposite side, by clicking the direction arrow.

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Begin modeling. The changes you make appear on just one side of the model until you right-click to apply the change.
This results in a complete cage for the entire body.

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To end symmetric modeling mode, select the Stop Symmetry command
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