Question shipping zones osCommerce

I have an actual version of osCommerce with some smaller modifications and I have a question about configuration of out-of-the-box shipping zones module <http://localhost/catalog/admin/[login to view URL]> How can I define multiple shipping zones.... for example zone one for US/CA, zone two US/...., zone 3 Canada, etc.... If this is not possible, what contribution could you suggest for it and how this contribution works.... (with samples for configuring). As I understood in the shipping zone module you define weight ranges and define the price for it.... ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Linux PHP MySQL