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Click the Lattice tool on the Deform tab.
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Select the points on your character to deform and press Enter to confirm your selection.
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Press Enter again to create a cage from the object’s bounding box or hold Alt to select a deforming point cloud from another object and press Enter to confirm your selection.
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Click the transform node in the network editor.
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Move the points of the cage in the scene view to deform the shape underneath.
For more information see the Lattice deformer help.