How to have a network of question and answer sites like stack exchange?

Question

I want to implement multiple question and answer sites on same base domain but with different subdomain.

I want questions and tags to be independent but user account are global i.e. one account can access all the sites, but like in stackexchange different user stats, and powers like editing, upvoting, moderation etc should be specific to site(s).

How do I easily acheive this.

Comments

do you mean like

https://gateoverflow.in/

https://ee.gateoverflow.in/

https://me.gateoverflow.in/

same user base but questions are different on each site. The plugins are same but the plugin settings are different in each site.

If so, we are using https://github.com/NoahY/q2a-network plugin for that.

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yes exactly that. thanks.