I am not sure how to explain this (probably the same reason I haven't been able to find anything on google either :) )
But, I will try to explain:
I wan't to create a product page, and this can be any product, from an amplifier, to a cell phone.
But I wan't just 1 content type for it.
I assume that the product category should be easy to implement with a vocabulary, and just add terms from within the "create product" page. eg. Amplifier, cell phone, monitor etc.
the next step is where I need some help.