How to implement such ordering logic?

Question

Magento

The site is a furniture store.
Based on this specificity, it is required to realize not only the cost of delivery, but also the cost of furniture assembly. The cost must be calculated as a percentage of the total cost of the order (excluding shipping), must be enabled/disabled (that is, the buyer can order assembly or not order) and displayed in the shopping cart. And also the value of this allowance should be customizable either from the product category (better) or from the manufacturer (less flexible, but also fine).
Can this be done in Magenta?
Please advise in which direction to dig.

Answer 1

> Whether it is possible to implement it on Magenta?
Can. Through extension or direct customization of default modules.
> Please advise which way to dig.
Post a task on a freelance exchange.