I need to de-index some content from Google.
We have a main domain
main.example.com which has listing of E-commerce products. Also, we give this for internal use to companies on their subdomain. Example:
company1.example.com company2.example.com … company100.example.com
Problem is, Google is detecting the content of our main site as duplicate.
How can this be prevented? I am ok to block crawling of microsites as they are for internal use only.