I’m not sure if limbs can be detached through the disconnecting of bones at runtime. You could clone the limb and scale the bones or have spare parts that can be spawned in at the joints and scale down the severed limb to zero to hide it (through covering up remaining wounds would be tough).
Maybe someone has more knowledge on the matter. I’ve seen a couple of posts that mention solutions, but haven’t followed them. Perhaps the forum has a more indepth example somewhere.