Hi,
I'm currently working on transition to Unified Interface (2020 release wave 1).
In old environment when I wanted to add an existing product (Order Product) to an order using Lookup dialog which displayed the related price list items.
In unified interface I have similarly a subgrid of Order Product on main form of order that I can use to add product using the quick create form of Order Product. Unfortunately I really need that functionality to be able lookup between Price List Items but even after many researches I could not find a solution.