Ok....it's not in the Commented config, but in the config.bin file in "Res\Addons\O_wp.pbo"!!!
The unit name is SoldierGSniper, so the tree should be
class All{};
class AllVehicles : All{};
class Land : AllVehicles{};
class Man : Land{};
class Soldier : Man{};
class SoldierG : Soldier{}
class SoldierGSniper:SoldierG{};
class Your_Unit:SoldierSniperG
{ Your Defines }
Let me know if this works or not....and if you will release the Addon.
CU