Glass Refrigerator in Blender

This is my first project in Blender! I finished my course and this was the first time I tried to make something on my own:

Refrigerator in Blender

I gave up on trying to make a glass material in Blender that can import into Unity correctly. I just removed the glass panels entirely from the object. This has taught me to try an avoid making objects that use glass. I've only found tutorials on making the entire object transparent. Is there a way to make a part of geometry transparent?

If you know any secrets to transparent geometry, please let me know!

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Fascinated by low-poly objects in videogames. I'm aiming to create 100 objects by the end of 2023!