Google analytics for subdomain
Re: Google analytics for subdomain[ Edited ]
April 2016 - last edited April 2016
You need only one GA accounts.
Guide to Tracking Multiple Subdomains in Google Analytics @ http://www.ericmobley.net/guide-to-tracking-multiple-subdomains-in-google-analytics/
If you want to know everything in depth please check this @ https://www.optimizesmart.com/cross-domain-tracking-google-analytics-works/
Hope this helps.