We refer to that set up as a multi-data center or roll-up view. There
is nothing that's built into HQ at the moment to present anything.
However, you can certainly develop your own set up and create SQL or
custom (HQU based perhaps) plugins that can pull data out of the sub-
HQ servers and report them to the roll up server. This is all, of
course, easier said than done :-), hence not a feature we currently
offer.
Charles