I needed to filter a subset of objects from one connector or adapter (i.e. All Organisation Unit objects) to create separate connectors or adapters for just those objects (i.e. All Business Units).
There does not seem to be any way to filter using Broker's built-in functionality, so the solution I chose was to write a powershell script to perform an LDAP query against Broker and populate a new connector based on the selected subset of objects.
Please consider adding this functionality (or something equivalent) to the base Identity Broker product.
Customer support service by UserEcho