[2020] how to reserve goods?

Originally Posted by saikrishna000
hi,
the "shift click" +- option not working while i am creating the trade route in the latest build...is there any other way to reserve a certain amount of goods to an island for ex i need to always maintain 50t of coffee on island "A" and created a trade route to transport 30t form island A to island B so here island A has total of 65t of coffe so the ship should load only 15t of coffee and unload that 15t coffee on island B