You say you want to "give certain factions certain units to be available in a multiplayer battle". Do you then not mean that you want to add any units to certain factions? That is what that tutorial tells you, and also what the abbreviations I used mean.
I guess I don't understand what you want. If you only want to reduce each faction's roster, the MP EDU backup in the EB folder is your friend. You did read the frequent issues and FAQ, right?
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