no, maybe my english is not so good...but:
1)the domain is mine (ours), and yes, i can prove this (and i've sent to DH support all documentation and email)
2)I can easy modify the DNS from this subdomain to dreamhost.
the problem is about adding my parental domain to my DH user (see the second post, with the procedure. i'm talking about 1st step).
Can I bypass this step renaming my url folder and point the DNS to DH?
Anyway, thanks a lot Scott!