Details :

For each option, my scripts look at the "From" meshes and remember the joints that have an influence on it, moreover, whether the "To" mesh already has a skinCluster or not does not matter because it will be created or replaced by another skin cluster with the corresponding joints.

So here it is with its 3 options:

• Each to each requires the same amount in the from and to selection, you can sort it alphabetically, and it will transfer the skin from one to the other according to its location in the column, so it is essential to have a good nomenclature

• All for one is when you have several meshes and you have an original one that covers all the small ones, so it converges all the skins to that one.

• One for all is the opposite, from a single mesh it gives each of the meshes the same skin as the unified mesh.