There are two ways depending on what you are trying to accomplish.
If you want teh german civ to be able to upgrade a unit to it's unique tank and have all other civ be able to upgrade the unit to the normal tank then you just need to set it's UnitClassUpgrades to Unitclass_Tank.
If you want to be able to upgrade the unit to the german tank regadless of the civilization then you need to create a unitclass and unit of the german tank that it can upgrade into. This will however enable all civs to be able to build the german tank unless you set it's buildable to -1 (IIRC). Using this method however I am fairly sure you can create a unique upgrade only tree.
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