Once you have a device's sysObjectID, you can match that sysObjectID up to a group in NMSROOT/lib/classpath/com/cisco/nm/cwcs/mdf/mdfdata.xml. This is file used by Common Services to build the device type groups in the device selector. You would need the DEE data for this. A DCR export would give you the sysObjectID and the MDF ID, both of which could be used to map to a device group in the MDF.