Code to support an extension to an LDAP Group query to query specific roots such as under an OU:
 
[RootDSE:OU=ADS,OU=ADB,OU=ISV,OU=OCD,OU=EXE,DC=hcso,DC=tampa,DC=fl,DC=us](&(rest of my query))
 
See same topic Discussion for more details and discussion