Adding shogun requirement for unit

[Paladin94610]

I would like to add shogun requirement for some units just like Great Guard cavalry and Nihon Maru. I wonder which files and where I have mod? I searched it in unit.tables and scripting.lua but did not find it. Could you please help me guys!!

[Destin Faroda]

I doubt a shogun requirement exists. The game can only handle buildings, religion, resource and region requirements.
You could limit a unit to the Kyoto province, so only the holder of Kyoto (usually the Shogun) can hire special units. That is possible. However, it wouldn't work for ships as Kyoto doesn't have a harbour.