Unrelated characterstics for a product

Hi,

The goal of the characteristic / variant system is precisely to be able to have different variations of a same product that can be configured as if they were a different product. So each variant is a combination of values of the characteristics of a product.
For example, if you're selling shoes in different sizes and colors, it makes sense that the size and the color are characteristics, with each combination of values being a variant so that you can potentially provide different images for different variants, different stock, different prices, etc.

This is not adapted to your case.
To have "independant characteristics", you can use instead options. Here is an example on our demo website:
demo.hikashop.com/index.php/en/hikashop/...ct-page/with-options
Here is the documentation:
www.hikashop.com/support/documentation/i...ct-form.html#options