We recently moved a community website that we own to our main domain. It now lives on our website as a sub-domain. This new sub-domain has a lot of duplicate page titles.
We are going to clean it up but it's huge project. (We had tried to clean it even before migrating the community website)
I am wondering if this duplicate content on the new sub-domain could be hurting rankings of our root domain? How does Google treat it?
From SEO best practices, I know duplicate content within site is always bad.
How severe is it given the fact that it is present on a different sub-domain?
Thanks for the feedback!
Update: I need to move this topic to the Google SEO forum. Not sure how to do this.