Hi Diego:

You have 2 options based on your situation.

Option 1. Set up 2 "Fiscal Positions" - one for "Frozen" and another for "Cooked" and select the Fiscal Position in the Other Info tab on the Sales Order. However, this will only work if all the items in the Order are of the same type.

Option 2. Edit the value in the Taxes field and set it manually on the Sales Order line. You can set the default rate to the one that is used the most, so that you have to edit the rate only in a limited number of cases.

Hope this helps.

Well, yes, that's an option, but the problem there is that I will have in the inventory 2 products, when is only one, then, at inventory level, that's a problem. Thanks anyway for the suggestions. 

In Odoo 16, you can set up different taxes for different products or variations of a product, such as frozen vs cooked products, by using the Sales Tax feature. Here are the steps you can follow to set this up:

1. Go to the Accounting app and click on "Sales Taxes"

2. Create a new tax with a rate of 15% for frozen products that will not be consumed in the place.

3. Create another tax with a rate of 10% for cooked products that will be consumed in the place.

4. Go to the Sales app and click on "Products"

5. Create a new product for the frozen version and assign the tax with 15% rate.

6. Create another product for the cooked version and assign the tax with 10% rate.

7. In the POS, you will be able to select the product as cooked or frozen, and the corresponding tax will be applied automatically.

Alternatively, you can use the product template, where you can have a product template and then create variants (frozen and cooked) with different prices and different taxes.