Invisible Body Parts

Greetings

Does anyone of you out there know how to make body parts individualy invisible on the player?

I*ve searched around the whole Internet for like 4 hours or something and I didn't find any solution to my problem.

My idea is that you can have prosthetic legs but the problem is that everytime I load up the model and apply it to a armor it just doesn't work for some odd reason.

I'm running out of ideas, but I still want to finish this up. Please anyone..just help me.