Hello,
You chose the wrong way. There is no option to link the product category to single product. But there are plugins to show the variations separately. For example
https://woocommerce.com/products/products-by-attributes-variations-for-woocommerce/
https://wordpress.org/plugins/wpc-show-single-variations/
https://wordpress.org/plugins/woo-show-single-variations-shop-category/
https://iconicwp.com/products/woocommerce-show-single-variations/
Did not test these plugins, so can’t guarantee 100% compatibility but you may try.
Regards