Can you create Sub-Categories in a community site?
I have a customer who likes the categories but wants to break it down even further.
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I would say add a Managed Metadata column. https://support.office.com/en-us/article/Create-a-Managed-Metadata-column-8fad9e35-a618-4400-b3c7-46f02785d27f#__toc355082380
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