Mapping a subdomain of a add-on domain in multisite.

Hi guys,

Im trying to map a subdomain for a support site connected to a domain that is not my main multisite domain.

the main multisite domain is
http://buntingmediagroup.com.au and all the sites are a sub of this url and mapped via your domain mapping plugin.

The sub site I'm working with, is on the domain lawyers.buntingmediagroup.com.au and has the mapped domain http://aussielawyerdirectory.com.au attached. I need to create a subdomain site for the support site. So i created the site support.buntingmediagroup.com.au on the multi and installed the portal. can I map the sub domain support.aussielawyerdirectory.com.au to it to keep it uniform?

eg

Multisite domain
buntingmediagroup.com.au

Sub site
aussielawyerdirectory.com.au

Site needed
support.aussielawyerdirectory.com.au

Thanks!
Brendan