I don't know what is the best way of doing this. The idea is that I have about 500 products. I created 11 Attribute Sets (to cover 11 product categories). These attributes are filterable. But I need to set different options for each product's attributes. So custom options are the only solution I see (I can't create different attributes for each product).
How can I set different attribute options for each product?
If 1 is not possible, how can I make Custom Options Filterable? (like attributes "Use In Layered Navigation")