I have tried linked product, and i found that can not meet my demands, 2 issues:
1. different category display different product urls: cheap-eyeglasses-usa, and cheap-eyeglasses-usa?cPath=2&, although canonical is used. I think does not look good.
2. i play to use different category template, and different product template, and let them display something differently. if use linked products, all are the same;

what i need is just like www.cheapglasses123.com . set all different attributes first, and choose some to let them have categories function, say: gender: man, women, kids; lenses: single, bifocal, progressive, shape: full rim, half rim, and rimlesss...

how to do, pls?