Details on how to sell slaves
Ok first you need to have a province all by yourself.Then you issue an edict and you will find one with the broken chains icon called "Sell Slaves".When you do automatically from the next turn the percentage of slaves in this province will start to be reduced by 50%.Also automaticaly your income will increase.You dont have to do anything this all happens auto and you can see the effects in the economical details tab in each region.
If you have a slavery in the province the rate of slaves will be reduced mor slowly and you will have an increased income for more turns.
You dont control the prise ond you dont choose to which country you are going to sell.This is happening by the game itself in auto mode.I keep saying that because some people havent figures it out.If you have any questions shoot here....