Now that attributes are gone...
How do I specify certain attributes across different categories in the store? For example in v1, I had a "best sellers" page and I products from a bunch of categories in there. I suppose I could make a "best sellers" custom view but wouldn't I have to re-add products that already exist in my store? Next I was thinking about adding a custom query string to specify the product IDS, but what if my page had hundreds of products.. that would be a huge query string!
Any best practices for this would be much appreciated.