Adding Subclasses
 

I've looked over the tutorials and the information for adding a new class is there, but what's the best way to go about just adding a subclass to an existing class? If I choose Fighter, lets say I'd like to be able to pick what's already there or a new subclass such as the Eldritch Knight?

Subclasses are class custom abilities.

Yeah, they are covered in Tutorial 3, where you first make a simple class, and then make two simple archetypes for it.

Ok, I think what I'm missing is how to add a subclass to an existing class, not a custom one?

In tutorial 3, the step where you are choosing what class to associate the custom special ability with, choose one of the existing classes from that list.