If your favorite Visio template doesn’t include a stencil you want, add the stencil to the template, then save a copy of the improved template.
Add a stencil to the template
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              In the Shapes window, click More Shapes. 
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              Click the stencil you want the template to have—move your pointer over the categories to see the stencil lists in each category. Checkmarks indicate stencils the template already has. 
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              The new stencil appears in the stencils list in the Shapes window. 
Save the file as a new Visio template
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              Click File > Save As. 
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              Choose a location, and in the Save as type list, choose Visio Template (or Visio Macro-Enabled Template if you added macros to the file). 
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              Give the template a name and click OK. 
Find and open your custom template
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              Click File > New, then below the template search, click Categories. 
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              In the Categories gallery, click New from Existing, then click Create. 
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              Find your saved template and click Open. Tip: Pin your new template to the “Recent Drawings” list, so it’s easy to find. Click File > Open > Recent Drawings, find your template file, then click the pin icon 
 
                         
				 
				