It's technically very easy to add another GHQs.
But you should be careful, because lots of them will clutter map icon layers.
Here is a picture with second AUS-HUN GHQ, so Central Powers have 5 of them (2 German, 2 Austrian, 1 Turkish):File modified:
1-CEN.fac (your HDD->To End All Wars\EAW\GameData\Factions\here)Line modified:
GHQInfos = GER|OHL|Army_Badge_GER.png|$Berlin|AUS|K.u.K. Armee|Army_Badge_AUS.png|$Wien|ITA|Armata Real|Army_Badge_ITA.png|$Roma|TUR|Ottoman Army|Army_Badge_TUR.png|$Constantinople|GER|Ober Ost|Army_Badge_GER.png|$Berlin|AUS|Sud-Ost-Front|Army_Badge_AUS.png|$Wien|Text added:
In fact there were 2 Aus-Hun GHQs. One for Russian front (with Generalstabschef Franz Conrad von Hötzendorf) and one for Serbian front (with Feldzeugmeister Potiorek) and later for Italians (Oberkommandierenden der Südwestfront Generaloberst Erzherzog Eugen).
Meteoryt-like user. Strikes and disappears.