How do I edit available rosters for, say, Massalia?

[antiochosvii]

I want to enable Gallic warbands from the start, as having the regular Hellenic roster is a recipe for suicide against the elite Arverni warbands. What would I edit or add to allow Massalia to recruit a basic Gallic warband impact foot unit from the start?

[loki100]

You need to alter the 'Units' spreadsheet.

But the core problem is that warbands are not a Hellenic unit so if you add them so that Massalia can use them as a form of medium infantry then all the Hellenic powers will get them.

An alternative might be to add them as a provincial unit for where Massalia is located, but even so that forces you to create the province by some form of expansion

[Pocus]

No, the simplest way is to add them as part of the nation roster of the faction, faction file.

I'm away a few days, so don't have access to the game files, but you should find for each faction 3 column, one are the units available at CL1, then another for CL2 and a third to CL3. Just add the units you want in the appropriate column. Anything is allowed, as long as you pick their reference from the units file.