Making a mod for only one faction

[ReneTS]

Is it possible to make a mod in file pack manager, that only applies to a certain faction? Like giving charthage in Rise of the Republic extra tax income. I know how to make it so it applies to all factions, but can you make it faction specific?

[Gyrosmeister]

You can create a faction trait for Carthage in Rise of the Republic that gives them extra income. Carthage is not playable though so you need to create some political parties for it (2 are enough) first, make one the ruling party and give that party the traits you created