From the blog "crabb's Blog"

I'd like to talk about fixing randomly generated townies     If you have a new game, or a game pack that won't stop generating sims with the needed skills to fill special roles, then you may have a lot of ugly sims generated.  In my game, there are about 320 sims (You may have fewer sims than this, I don't know how many the game needs) but it is a very long process to go into CAS for each of these sims.  The fastest way I found to fix multiple sims in your game is by pasting sims