Saving a Sim born in Game

[sdhoey]

Is there a way to remove skills, aspirations etc from a sims that was born in game? Like one from a dynasty that you want to use again?

[Playalot]

The only way you can do that is if you make a clone/twin of that sim. They will look nearly identical and have no skills etc. You'll just have to dress them and choose the hair etc to make them look the same.  I think clones or twins are banned from official dynasties/challenges though so check in the the challenge team.