I am moving over a site to WP and I have content, and five different types of attachments. Each attachment type is now it's own content type and shares the same taxonomy registry as the content (posts). Can I dynamically render items inside a post only when they have the exact same category & sub-category & sub-sub-category attributes?
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Sorry for late reply, it seems this could be possible, but not from the option available right now, you will have to use filter hook for query arguments.
please see the documentation how the filter hook works
Let me know if you understand or not the filter hook and any help needed.