You can apply, create and duplicate materials using the
Material Browser.
Warning:
Materials applied in parts created before 2016x might look different between
Visu mode and Design mode. If so, proceed in the following order.
Refresh your part then:
if you have the proper rights, change the design or the graphic
properties, and save the part.
otherwise, copy the features of the part in a newly created part,
and then save it.
Apply the material again in the newly created part.
For more information about materials, see Material Definition
User's Guide.