@mike141500 usually it’s the Soviets that can get more units on the Manchuria border more easily without sacrificing units for other activities pre 1939. This is no issue.
Can the original factory in Rehe be upgraded?
No, cant upgrade factories outside home country.
@timothy-gengarella But there is nothing to stop you from added more factories in Manchuria but because Japan has naval supremacy in that region. It is smarted to just shuck with transports from the homeland.