How to add Components to some individuals parts of a prefab

Hey guys, I have a question for you because I’ve no idea how can I solve it.
I have a prefab with a entire 3D scene inside, and I would like to make a script in C# which will allow me initialize some 3D models of that prefab with a rigidbody and colliders.

How you can see in this picture the hole scene it’s my prefab and I would like to add to this tables a box collider and to some tools are on that tables some mesh colliders and rigidbodys also. And that I wanna be possible via script, not manual from Unity interface.

So if anyone of you have any idea how can I solve this problem please help me and… give me some advice.

Thanks

hi with " AddComponent " u can add anything via script
like here ;

        gameObject.AddComponent<BoxCollider>();

or u can find and add ;

        GameObject.Find("Table").AddComponent<MeshCollider>();