Re: how do i edit a sim after I saved them into my library

@KittyMeKpop You will need to place the sim in a lot in one of your game saves then (even if you evict them from the lot) you will find them in "My Households" in your "Manage Households" area (top right of the screen) in 'Manage Worlds' in the game save. You can edit them there, or within your lot as you are playing them by opening them up in CAS.

Help with managing/merging households: https://www.ea.com/games/the-sims/the-sims-4/news/splitting-and-merging

Using CAS: https://www.ign.com/wikis/the-sims-4/Create_a_Sim