Hi, I would like to track a subdomain like forum.example.com and the regular domain example.com and www.example.com separately, ie. not having the forum subdomain results appearing twice. The examples are not that clear. It seems that stating example.com will group all subdomains (hence forum.example and www.example).
You can create a URL channel for www yoursite.com and one for forum.yoursite-com. In the main window when you log on to your Adsense account you will see clicks, CTR and impressions for each individual channel.