Adding New Civ:

[Lavindathar]

How do i add new Civ's without overwriting others??

I missed the tutorial, and I dnt know cos I have never tried.

 

[Haverlock]

You can add new civ, but game crashes when you go to foreign advisor screen. It's because bug in game. I hope that Firaxis repair this bug in future patches. It's annoing that you can't properly add new civs. Until that replacing one existing civ is only good way to add new civ.