Categories.yml

In the categories.yml file you will be able to create different categories and have a list of materials for each category:

categories:
blocks:
name: blocks
materials:
- STONE
- GRASS_BLOCK
- DIRT
...
potions:
name: potions
materials:
- BLAZE_ROD
- GHAST_TEAR
...
tools:
name: tools
materials:
- IRON_SPADE
- IRON_PICKAXE
...
weapons:
name: weapons
materials:
- FLINT_AND_STEEL
- BOW
....
misc:
name: misc