I'm using K2 to build product pages, each product comes "grouped" with a main page and three sub-pages. When going to the product page there will be the product title and underneath that will be three text links pointing to each of its sub-pages.

My question is regarding the sub-links under the title, what is the best way for me to link to those sub-pages?

I thought about creating an Extra Field for each of those sub-links, which would work great, but say I used Link as the extra field I didn't see how to 'choose' the sub-page I'd be linking to.

Would I use tags and related items to link the "group" of pages together?

Thanks.