unity – How to add some organization to my PSD Imported image with bones generated by the Skin Editor

I have an Image in PSB format imported using the PSD Imported and I have generated bones using the Sprite Editor > Skinning Editor, all good.

The problem is that when I try to add some organization to the object in my inspector I can not do it without breaking the Prefab. We can just Unpack the prefab but then I can not modify the bones anymore using the Skinning Editor. I am trap here.

How can I add some organization to the generated Prefab?

enter image description here