How do I choose which CW factory supplies the build point to China? The router chooses Montreal, and routes it around the world, rather than choosing the nearby Calcutta.
In preliminary production planning, go to the production screen for the CW, and click on the factory that is sending the build point. A window will come up asking if you want to change where the build point is coming from. You can change where the build point is coming from.
Unfortunately at the moment there is a bug, and saved build points can not be changed. MWiF will ask if you want to do so, but then does not actually change anything. Factories, however, work.
I believe that this must be done no later than preliminary production planning; all trade is locked at that point, and can not be changed in final production planning.
I thought I knew how to play this game....