How can i find out which subdomain is bringing majority of traffic in Google Analytics

I have around 20 websites on 20 sub-domains , all are using same Google analytics code for tracking hits.

One of the site i.e. sub-domain is getting lots of hits, i would like to know more about that sub-domain only. and that site only. .e.g. bounce rate of that site, avg. page-views., avg. time spent on that sub-domain.

How can i know something like that ?

i have already added Filter in Google Analytics to show sub-domains too in the reports.

e.g.

Filter Name : Add whole domain
Filter Type : Advanced
Field A -> Extract A : Hostname (.*)
Field B -> Extract B : Reuest URI (.*)
Output To -> Constructor : $A1$B1