need more castles

[Data78]

I've been trying to make a campaign where I have the option to turn cities to castles via edb, thus far no success, I've tried looking up tutorials, and I have had no luck

[Vissewalde rex de Gerzika]

There is a certain level after which you cant convert cities to castles.

[Data78]

no my point is that I want fortress and citadel conversions...