C3 pillaging (Little Upsilon)

If you're just taking over a c3 to get it's money, how do you get rid of it when you're done?

Log in under the new country like you would your normal country. Then go to the "General" options (top left of the screen), then "Register", then "Cancel your country".
It will have a "are you sure" button and have the name of the new country that will be canceled.
Not sure if the cash auto transfers or not. I just do it manually to be safe, (3T per game month max) then cancel.

How do you get rid of a C3 now? I don't see a "Cancel Your Country" option under the "Register" choice.

Its now on the portal page. register--> cancel countries. It brings up your full list of countries,then you check the one you want to remove.