How to browse info by subdomains

I need to track all subdomains and browse by sumdomains ,for example , I track example.com and I want to know the visits of example.com and *.example.com . How to solve the problem ,
Thanks for your reply !

Please see the Faq: How do I track several websites, domains and multiple subdomains in Piwik?

Thanks for your notice , I have read that FAQ , but I think it just tell how to track rather than how to browse by the dashboard . I want to view visitors , unique visitors ,visits etc by subdomains and the main domain as well. Is there some solution ?

You mean segment by sudomain?

[quote=vipsoft]
You mean segment by sudomain?[/quote]
Yeah , that 's exactly what I want , sorry for my poor english …

From the Manage Websites documentation:

Page title containing the domain name — by default, Piwik does not report the domain name in the Pages reports.For example, two page views on support.example.org/index.html and checkout.example.org/index.html are reported under the same ‘index.html’ page title in Piwik. You can easily customize Piwik to prefix the domain name in the page title.

see http://piwik.org/docs/javascript-tracking/#toc-customize-the-page-name-displayed-in-piwik