Good morning, I was wondering if you could change the material of a whole at the same time (not the individual parts) or there is an add-on that allows it?
from the menu "management" ---> "different components".
in separate components you can change the material of the components of the axieme.
do not change the material of a set, because it is a combination is tautologically composed of several parts; you can change the material on the single part.
your set is simply a frame (welded shoe): same reasoning.