When you need a specific shape, find a shape that’s close and customize it to suit your needs.
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Right-click a shape, select Add to My Shapes, and choose the stencil where you want to store the new shape.
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Open the stencil, right-click its title, and select Edit Stencil.
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Right-click the shape, select Rename Master, and type a new name for the shape.
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Right-click the shape, select Edit Master > Edit Master Shape, and make changes to the shape.
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Select Close Window.
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Select Yes.
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Select Save in the stencil title bar.
Source: Microsoft