SEO friendly subdomain for Drupal 7 website

I am searching for a way to create subdomains for specific content on my website. I checked a few modules but I did not find any stable versions to make this running as it should. Can anybody tell me how it is possible to add subdomains for specific sites in an SEO friendly way? I want to make the structure of site more user friendly with this and i would also like to increase the SEO of the website. Can anybody give me good tips?

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