If you want to use a custom shape, create one using the drawing tools in Visio.
Find and use the drawing tools
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Select Home.
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Select the More arrow next to Rectangle to see the list of drawing tools.
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Select a tool, and drag on the drawing page to draw the shape.
Draw a custom shape
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Select Home.
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Select the More arrow and then select the Freeform tool, the Arc tool, or the Line tool.
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To draw the first segment of the shape, drag on the page.
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Select the vertex (
) at the end of the last segment you added, and drag to draw the next segment. -
To close the shape, drag the endpoint of the last segment over the vertex at the beginning of the first segment.
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To add a color to your shape, select Fill and choose a color.
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If you'd like to remove the border from your shape, select Line > No Line.
Create an identical shape
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Select Copy > Paste to duplicate the shape.
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If you'd like to reverse the shape, select Position > Rotate Shapes > Flip Horizontal.
Edit a custom shape
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Go to Home, and select the Pencil tool.
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Select a shape.
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Edit the shape:
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To delete a vertex, select it and press Del.
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To add a vertex, press Ctrl and select the spot where you want to add a vertex.
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To move a vertex, drag it to a new position.
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Rotate a shape
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Select the shape.
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Select Home > Position > Rotate Shapes, and choose the rotation you want.
Group shapes
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Select the shapes.
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Select Home > Group > Group.
Add a custom shape to your favorites
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Select More Shapes > My Shapes > Favorites.
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Drag the custom shape onto the stencil.
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To edit the stencil, select Yes.
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Select the custom shape on the stencil, and type a descriptive name to rename it.
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Select Save Stencil.
Source: Microsoft