eh... the duchy of itau can't be part of duchy of via... you are still confused between city and duchy. from the looks of the realm page, you got appointed as the lord of the city of itau (which is part of duchy of via).. and that's it.
if you are dead keen on the name duchy of itau, then get the ruler to dissolve the empty duchy of itau.. .then create new duchy of itau from the city of itau.
if you don't care about the name, then just get the ruler to create a new duchy of whatever from the city of itau.
obviously... a new duchy doesn't have to formed from the city.. could be formed from the townsland... depends on who the ruler wants as duke.
