You now have the ability to use a Group from a agency master account in an agency sub-account. This provides for centralized Group administration - simply upload the Group to your master account, and then you can send to the Group from within any sub-account.
Group sharing between the master and sub-account can be turned on or off at the individual sub-account level. So you can set some of your sub-accounts to display Groups from the master account while other sub-accounts only display their own Groups.
If you would like to activate this feature for your master/sub-accounts, please contact JangoMail support.