I have noticed if I change the NAME of a Variant, the name of the Product Template is also changed (so all variants must have the same name).

I have noticed if I change the INTERNAL REFERENCE of a Variant, each variant retains a unique value (so all variants have their own internal reference).

I have noticed for some fields, like "Sales Price" when I change the value I am told "The sale price is managed from the product template. Click on the 'Configure Variants' button to set the extra attribute prices.

How can I find out which fields are shared between Product Templates and Product Variants, so that I can find out which fields will allow a unique value for each Product Variant?