Sort Materials into Subgroups

Materials should be sorted in the selector from general to specific with major groups acting as containers for specific examples of such materials. IE: Plastic acts as a parent material with the children PLA, ABS, Nylon 12, LEGO. Metal acts as a parent material for brass, aluminum, stainless steel, etc. This has the added benefit of improving search results as in this example: I am looking for a plastic puzzle by material, but it is specified in the database to be PLA, searching for plastic will show all child materials as well, allowing me to find the plastic puzzle I was looking for.