The following link might be of help:
https://www.axisandallies.org/forums/index.php?topic=30776.0
:mrgreen:
Hello,
I got a newbie question….may I upgrade a minor factory that is originally controlled by other country? For example if I am a Germany player may I conquer India factory and than upgrade that one into a major one for my own use?
No, you can’t. Quoting the rules:
Major industrial complexes can only be built on originally controlled (not captured) territories with an IPC value of 3 or higher.
While India does have a sufficient IPC value for a major industrial complex, it would not be an originally controlled territory for Germany, but a captured one.
Ah got you. Thanks for quick response.