messing with the database/pages

I want to set up a structure like this:

Zip Code -----> Supplier -------> date/comment
--------> date/comment
--------> date comment

zip code ------> supplier -----> date/comment
-----> date coment

so it is many zip codes - many suppliers within zip code - many comments within suppliers by date

Searchable by zip code

Can it be done with atahualpa/wordpress or will I have to look elsewhere?