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[eluser]Sumon[/eluser]
I think, you need number of controllers like products, portfolio etc..etc.

Product, portfolio or contact all mean different. So isn't it wise to create different controller's? Furthermore, products(or you can consider sub category) under categories can be dynamically added. For example tshirts and sweaters are items under Product category.
I might not reply as you expect. if it is, then sorry man.