Joomla - adding custom parameters

As usual I don't get replies on Joomla forum, and so far I love StackOv开发者_开发知识库erflow, and I'm asking my next question.

I have custom component for products. In that component I have Categories, Subcategories and Products.

I want to filter the products according to some parameters. So I thought adding params would be a good idea.

So far I found one article about adding custom params but it didn't work for me. I don't want to add param to the whole component.. I want to add param to only my Products view.

When user clicks add product that parameter selection should appear.

P.S. did I explain quite enough?