What happens if you only have Products for categories_id 51 in the cart? And is the master_categories_id on each of these Products also 51?

What happens if you have a cart with Products from categories_id 51 and other Products from other Categories?

If the current Table Rate works for all Products, except when a Product from categories_id 51 is in the cart ... can you just add an additional charge to the current charge that is being calculated by the Table Rate?

Something like if 1 Product from categories_id 51 is in the cart add $XX.XX and if 2 Products from categories_id 51 is added to the cart, add something like XX.XX * 2 to the cost already calculated by the Table Rate?

What method is the Table Rate table shipping using? Item, Total or Weight?