Let’s say you’ve created a shape, a label, or a drawing that you want to use later, but it’s not a part of the default stencils that Visio offers.
You don’t need to try to recreate it every time you need it because Visio allows you to save it and use it every time you need it.
All you need to do is go to the left toolbar, then to “More shapes,” and click on “New Stencil”. After that, just drag and drop the shape you’ve created into the empty space in the toolbar, right-click on the stencil and click on “Save as...” to rename and save it. And there you go! You have just added your custom stencil to the Visio library for later use.