Multiple OpenFire with domain+subdomain

Hi all. Sorry for bad english.

It is possible to link many openfire servers (about 10-11) so, that users can see all groups and all users from other server?

i’ve root domain msibank.local and many subdomains like tomsk.msibank.local… each has its own openfire server

i’m using pandion as client for openfire and can manualy add users test@tomsk.msibank.local, but it is possible to do this via AD?