But do supplies magically appear at the outbound port for shipping? Is that only for core ports? Or is that for no ports?
Given my recent experiences with the supply system, I am no longer sure :
1/ if the game expects you to only create outbound supply convoys in a
single lane from your core ports to wherever they are requested :
- Beijing -> Athina
- Stettin -> Leningrad
- etc.
2/ or if it's possible, and more efficient, to divide these lanes into several pieces, so that both land and sea supply lanes
collaborate, assuming of course that the middle port has a connection with your cores/capital :
- Beijing -> Kuwait + Kuwait -> Athina (Kuwait has a land connection with Beijing)
- Stettin -> Riga, Riga -> Leningrad (Riga has a land connection with Stettin/Berlin)
- etc.
Case 2/ could be further problematic if you have nothing equivalent that requests supplies at your "middle" port (Kuwait).
To illustrate :
- Athina has a whole army landed that needs supplies for the invasion of the Balkans.
- Kuwait has a single GAR that was fine with the crumbs that it used to receive till now, and won't request any more either through sea or land.
- Does Beijing know that the supplies sent to Kuwait also have to feed Athina ?
I doubt it. Therefore, it seems to me that the safer bet would be to create direct links (Beijing -> Athina), which has the downside of an increased cost in numbers of of convoys (because of increased distance).
Hopefully, I understood your question right.