I really hate to ask this, but how can I add units to a different faction?

[Chainsawfist]

Question, I put "Seleucid" into the ownership line, and every time I start up the game, it gets deleted, what am I doing wrong? Do I need to do the rest of the steps you described in the other thread? I'm opening the game to check if they're part of the Roman unit selection in the custom battle. They never are, but I haven't done those other steps and the other Roman units aren't, so, yeah.