During the creation of the Bacsktore, efforts were made to simplify the definition of the VAT rate and a number of other product details using product categories that have some common features.
One of these features is that we also set the tax rates by category.
When creating a product category, we set a tax rate that applies to a particular date for that category.
After we have defined the category when we add a new product, it will use the rate that applies to the selected category.