Microsoft Domains – Moving a domain to a different account

Hi Guys,

I administer a few different domains using this 'support@.... account under the  'domains.live.com' service.

I want to give access to ONE of the domains to another person, so that they can create and administer email accounts under THAT domain only.

But I don't want them to have access to any other domains I have listed under this account.

Is there a way to either:

a) Grant admin access to someone to just ONE of the domains under my support@ account?  or

b) Is it possible to move/export a single domain (with all email addresses), from our support@.... account to another account without disrupting the flow of emails?

Hope you can help - Thanks in advance

Simon