So as others have mentioned the thing your talking about is a sinicure.
So the process to getting one is long hard but not very complicated.
Firstly you need to decide what you want it to do. Depending on which bourse resource you use you’ll get a certain thing. If it’s mana your after you’ll need 10 Wain’s of Mithril minimum and 2 crown’s per wain. A hefty sum to say the least (without going into details if your going of just the income of you resource and your crap at trading it’s going to take 23 events of income to pay for it all)
So get trading.
It’s X time later you’ve got the Wain’s and thecash now you need it built. Your going to have to find a senator for this. You then need to convince the senator to use a motion to bring it up.
They have two of these per event. Good luck convincing them to use it for the sincure. And they need some to second it.
Ok so you’ve got the cash, the moxy and a senator is willing to spend one of this two motion’s and Thier best buddy ready to back them up. Time to put forward a comission.
Now those two senators having raised the motion need to get it past the rest of the senate. As in the majority of them need to vote for it. This is probably the biggest hurdle of the entire process. Why you ask? allow me to explain. See the empire can only comission 10 (plus 3 more through wayleaves more on that shortly) new things each event.
Each army, great work, spy network, fortress, trade post, magical college or statue requires one of these slots. To say completion is fierce would be an understatement.
If you have the money however (see a similar amount to what you spent to get the resources themselves) you might be able to buy an imperial wayleaf at the bourse action
Oops dodgy internet lost half my answer stand by