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

Technical Q&A

Topic summary

Adding add-on products with live pricing to the Shopify Brooklyn theme cart page. The request is to show extra products at the top of the cart, with the regular cart items below.

Add-on details:

  • Assembly: fixed charge of 25 per assembled product (currency not specified).
  • Bringing to floor: 7 euro per floor, with two counters—one for “start from” and another for “number of units (product parts).” Defaults for both counters are 0.

Requirements:

  • Each add-on is treated as a separate product.
  • When a user selects an add-on (e.g., sets Assembly counter to 1), the price should update live on the cart page based on the counter values.

Context:

  • Theme: Brooklyn (Shopify).
  • An attached screenshot illustrates the intended cart UI and counters (image provides key UI context).

Status:

  • No implementation details or solutions provided yet; the question remains open on how to achieve dynamic pricing updates for these add-ons in the cart.
Summarized with AI on February 3. AI used: gpt-5.
1

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.

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