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Hi @CoplenLisa,
Welcome to Microsoft Q&A, and thank you very much for reaching out.
Based on your description, from my research and testing, unfortunately Visio doesn’t support creating or importing custom icon‑set packages. However, you can still achieve a similar result by using your own images as icons and adding them to a custom stencil.
You can do this by importing a graphics file (.png, .svg, .svgz, etc.) through Insert > Picture or Insert > CAD Drawing, then selecting the image you want and opening it. You can also copy and paste the image directly into your Visio file.
Then, on the left panel, go to More Shapes > New Stencil, and drag your image into the new stencil.
Once saved by click on the Save icon, you’ll have your own reusable custom icon set.
For reference:
Import or insert graphics into Visio drawings - Microsoft Support
Add a stencil to a template in Visio - Microsoft Support
I hope this helps.
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