You can look into the corporations document.
If you look at the corporation page, go close to the bottom, there are several contract options.
one of them will allow you to contract the entire produce of the corporation to your own country with a single click.
try it.
also, when you click on corporations there are many tabs at the top of the page. above the list of corporations.
3 of the tabs are related to corporate contracts.
you need to experiment a bit but there, you could quickly create many contracts or cancel many, very quickly.