Use a syndication (feed) plugin such as https://wordpress.org/plugins/syndicate-press/ in your subsidiary sites to pull in posts from the main site. You can target specific categories of post – so this would help you to pull in just the posts that would be relevant to the subsidiary site.
This will help visitors to the subsidiary sites see content relevant to them, but it will most likely not have a positive impact on the SEO for those subsidiary sites, as search engines will already have seen (and indexed) the content from the main site.
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