Category Appears when certian product is selected

-- HikaShop version -- : 2.2.1
-- Joomla version -- : 2.5.14

I am trying to figure out a way, that when a certain item from a (one of many) category is selected, that a fee is automatically added to the cart. There were two ways I was trying to accomplish this. But don't know it is possible.

1. Add a category to my shop, add the fee as a product and it adds itself as an item to the cart, but then I need it to a second or sub-category appears with the options associated with that one product. (Is there a way to have a category of items appear when another product is selected, and if it is not selected it does not appear?

Or, my second thought..
2. Have the shop check to see when a product from that category is selected that the fee is added to the cart. But this fee is only added to a certain category of products and not the rest.

I don't know if this can be accomplished or not? Could it be?