You save them when you make them in CAS. I always use my Rincewind as my wizard, and he always comes with the same looks, one outfit of clothes, same traits. What he does NOT have is skill level or any points for completing anything. I have one male I'm particularly fond of who becomes my knight or king, same action. He retains his name, whatever outfit was at the top of the list, and his traits. Oh, another thing they don't retain is what they are. You choose that in CAS. So when in CAS if you have saved a Sim, you go to the line of words that says, "see Sims", or maybe it's see saved Sims. Anyway that brings up the whole menu of Sims. The ones you saved will have a little file folder icon on them and will have everything you made them with.