Hello, I am having a domain around 1 yr old and its rank 3 having nice BL . if i created a subdomain in my main domain and do some link spamming or keyword filling stuff and if that subdomain get caught by SEs is it effect to my main domain. And if i am having a 9 yrs old domain and i create subdomain in that is it effective(treated as old domain) or its treated as a new domain. Please suggest.