How to include extra products on cart page with live pricing?

[Minakshi15]

Hi There

i'm using Brooklyn theme

I want to add some extra product in cart page in top of the cart page and the normal added product show in below of the add on product.

First add on product is related to assemble and the charges of per assemble product is 25 and the sec product is bringing  to floor and per floor charges is 7 euro.  and the bringing to the floor have second product there are 2 counters the first counter for start from and second counter for number of units (product parts) at default all is 0. But each of these the products are separate if i chose assembly and in counter put 1, can it also show price in live, based on changing counter.