Products that are tagged can be shown as a single group of products on any page on your site using Featured products.
On the product page, scroll down until you see the Category field. Select Add new... from the dropdown menu and type a category name.
Adding a product category
There is no limit to the number of categories you can add, but each product can only have one category.
In the Tag field, type the name of a tag and hit Enter on your keyboard
Adding product tags