How do I add bodyparts to a Character on the client?

So you have a model, with a humanoid in it. When a player joins I want it to add the bodyparts from a folder in ReplicatedStorage/ReplicatedFirst into that model. How can I connect the joints so it works like a regular dummy? Or can I just clone the parts in and it will magically work.

I’m tryna do this because Humanoids cost server performance, so I want to reduce the performance by making the parts for the humanoid Local. But I don’t think it works just by copy pasting the parts inside of the dummy, as i’d have to connect them to the humanoid somehow.