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In QuickBooks Online (QBO), the option to add multiple categories to a specific item is currently unavailable. You can only select one category per product and services.
I can see how having this option would be helpful for you, and I'll take note of this. Our Product Developers are always looking for ideas from users on how to improve QBO.
If you want to learn more about managing product and services in QBO, I suggest checking out these articles:
Please let me know if you have any other concerns or questions in the comment section below. I'm always here to help. Have a great day!