Is your service offered for products of a certain category?

Question

CMS

Hello
For the first time on OpenCart 2.2 I create a site. Internet-shop of climatic equipment.
I want to add the service "Installation of air conditioning" after the tab "Delivery method" when placing an order. This is +7,000 rubles. to the order amount for each air conditioner in the order. Tell me how to implement this without violating the standard work of cms?

Answer 1

on one of the sites (which is also dedicated to climate technology), I made it easier, individual services, for example, the same installation of air conditioners, went as related products prntscr.com/b5fddj

Answer 2

As far as I know, all online stores have the concept of "Option" - some kind of bun for a product that costs some money, is selected before adding to the cart. You can also make a delivery option - simple and with installation, of course, for various amounts.