[Atrocities]

You cannot unless you do significant modding and then assign those new techs to Advanced Racial Traits.

For example if you wanted Beginer, Developed, or Advanced tech levels that you could assign to any race via the ART's then you would need each technology, each component, and each facility in triplicate, one for each starting tech level.

It is quite an extensive undertaking that really should have been built into the game from the start. However, most players think, and I am not one of them, that not being able to set the starting tech level for each individual player, is a good thing. To me its just dumb not to have this ability.