You can setup new, and edit existing, categories for inventory items by going to Settings -> Inventory -> Edit Categories.
We recommend using categories to describe "how an inventory might be used" rather than "what it is" (which is what Item Types are for). For example, categories for tools might be:
- Carpentry & Woodworking
- Metal Working
- Bicycle Tools
- Home Renovation
- Energy Efficiency
For Sports they could be:
- Winter Sports
One or more categories can be assigned to each item. Defaults for an Item Type can also be set.
These categories will also appear on your inventory browse page, and visitors/users will be able to filter your inventory based on category.