Non-standard AD setups

I’m trying to get Openfire working with my Windows Server 2008 R2 Active Directory setup, and the previous admin added a sub directory off the main Users directory which contains the actual employees. Find a screen shot attached.

Using the standard Users filter, all Openfire finds is the system users, which are in Users, and none of the users in SBSUsers.

What’s the best configuration to only get the accounts in SBSUsers?