Bademeister
Are you aftersome thing like this? You then use the value for MachineObjectOU in your TS.
[settings] Priority=DefaultGateway
[DefaultGateway] 192.168.5.2=HeadOffice 192.168.5.10=BackOffice
[HeadOffice] MachineObjectOU=OU=TestOU,OU=Computers,OU=Head Office,DC=contoso,DC=com
[backOffice] MachineObjectOU=OU=TestOU,OU=Computers,OU=Back Office,DC=contoso,DC=com