This may seem like a bad question, but I can't figure out how to add a second site. I submitted a subpage of a subdomain successfully (It was approved.) Are all subpages on that subdomain automatically approved? Are all subdomains of the main domain automatically approved? Even if the subdomains and/or subpages aren't related to the original successfully-accepted subpage at all? How do I add more websites?
As long as your new website is complied with TOS, you can put the AdSense code on it without informing Google. Feel free to check out my AdSense site. It is for AdSense site for beginner.
It can be as simple as cutting and pasting. I suggest you utilise channels within your adsense code. You can create channels from the Adsense Setup page on the Adsense site. It gives you better stats as to which site your getting the most clicks from.
If you are talkign about adsense, I guess wjhat google checks the first time around is whether you are a Human, because once ur account is accepted, you may add it to any damn site, which is funny though.