Sorry, I am a newbie asking a newbie question. According to Dustin Hoffman (Perfume), the EO's get mixed first and then you add the alcohol. I would think you start with the alcohol and mix in the EO's and aromatic molecules on at a time.
Also, do you make the base chord first and then work up? What if you want to use a substitute for alcohol, do you still formulate in the usual sequence?