Customfield as additional info in Product master.

You can use customfield as additional info in Product master.
The customfield can be defined as Dropdown, Text, or Number.

Menu - Setting > Customfield.
In some cases, we need to categorize the product we have.
So we can create Product Category as a customfield - set it as Dropdown type.

Tag it to Product menu on the availability tab.
If you need to filter the product category in sales / purchase document, then tag it to Invoice / Bills / Quote / Order.

You can import the product along with the customfield info.
You can also filter the product based on the customfield.