Modify prices of an order on the admin OPENCART

Situation: I am not using opencart as a conventional online store. I have sellers who make orders on my cart to their own clients, so, sometimes they sell the product for more, sometimes for less. Problem: Every time the seller sells a product on a different price, I can't change the price of the products when editing the order on the admin panel. I have to go on the database, and change the orders on the "order", "order_total", and "order_products" table. What I want: I want to be able to, when on the admin panel, on the edit order page, under the "products" tab, to be able to edit the product price for that specific order, just like I can do with the quantity. The opencart version used for this is the 2.2 Thank you.