So, it got me thinking. Now, I ask this with barely any CC creation experience. Is it possible to extract these items from AC Origins and convert them for use in TS4? If it's feasible, then where would I begin to teach myself how to do this? Any advice would be appreciated.
Making objects look good in a game is about much more than just the object. You should probably just learn how to mesh and you will then probably realize that making them specially for TS4 might be just as well. Taking objects from one game to another might just turn out a big letdown.
You might also be struggling a bit with copyright. Would you really be doing all the work for just using it in your own game?
What kind of objects where you thinking of? Are you sure the fancy objects arn't just textures applied on an uninteresting surface?