Categories are made up of fields. You can have as many fields as you want.
To create custom fields, you can click “Asset Categories”
Then, click “Add Field”
Then, create a new field for each field you need stored on your assets:
Note: you’ll want to use different field types to match the type of data. For example, a field to store Date of Purchase would use a field type of “date”.
Once all your fields are saved, you drag them to the right side under “Show these fields” and click “Save Category”
Next, when you add or edit assets within the category, all your chosen fields will be available for you to store data: