Hi @colomet,
I think you’re asking about duplicated content issues. The effects are summarized here:
https://moz.com/learn/seo/duplicate-content
In my experience, content archives rarely rank well. So, I think you should focus on segregation, increasing the chance for exposure for each canon.
In other words: I’d recommend setting the parent categories to use “noindex”.
Pages marked for using noindex, which aren’t excluded in the robots.txt endpoint, are still crawled and links within are still followed (unless nofollow is also used); so, this won’t affect internal linking.
If your site’s posts list links to their assigned categories, then they’ll be well found, too.
In other words: Generally, neither the subcategories nor their contained posts will be affected.
Ultimately, you’ll have to see what works the best via testing.
Cheers ??
