check the SEM_Client table
Navigate to
C:\Program Files\Symantec\Symantec Endpoint Protection Manager\ASA\win32
open the dbisqlc.exe
user name: dba
password: database password
Query to get the GUIDs is
select OU_Guid from sem_client ;
output to c:\test.csv
from AD you can get the guids using powershell
http://technet.microsoft.com/en-us/library/ee617236.aspx