When you will register your company information to WBC site first, you will also be able to register the category which you are interested in.
This service is when other companies register a new items in your interest category to WBC site, you can get a notice by e-mail from WBC what is new item registered.
If you are buyer or seller in world business market, we strongly recommend you to register the category which you are interested in WBC site.
Registration to your interest category is of course in free of charge to use and you can register in plural.
Of course, you can arrange or delete your interest category later from "my page" after log in.