/shrug
Use the worldbuilder then if you're just looking to experiment. You can control -anything- with that. Unit promotions, techs, gold, cities, tile improvements, resource bonuses - the works.
select the others city, and you can change the money
that doesn't work for me.
If you want to give an AI money.. then give it to 'em.Give yourself the coin then gift it to 'em on the next turn.