Didjynn wrotethank you, I wanted to avoid to duplicate but it does the job (quite boring when you have as much parts as I do).
If you have many skins then you might want to try this method instead:
Skins - Spine User Guide: New skin placeholder
You remove the skin placeholder, then select the attachment in question, and create a new one. If you're on the latest version of Spine, it will ask you if you want to duplicate the attachment for each skin. You select it, then delete the copy from the skins that don't need it by quickly changing skin pressing ,
or .
.
Didjynn wroteWill Spine add the possibility to create folders to organise the bones ?
Just create a bone to put all the bones within. I usually just do that 😃 And a folder would basically do the same thing.
I also recommend color coding the bones, and naming them so that the alphabetical sorting groups them together already.