Is there a plugin that can sort.... i try to explain.
If i have 4 cities. Detroit, London, Paris, Berlin.
If i have 10 "categories", lets say 1 - 10.
The user can in, lets say a dropdown menu, choose Berlin, and category 5 & 8 appear. ( whats set by rule of coz )
They can also choose category 7, and London appear or something. (reverse sorting?)
Crazy example...but need this for a big list of cities + typ of store.