Product Tier Upgrades

I don’t know if this is a feature yet, but it would be really cool to allow users to upgrade their products for a reduced price instead of having to pay full. Say I have a product I want to offer in a Base and Deluxe config, you can add a toggle to the product dashboard that sets a product to be tiered and then automatically reduce the price of the deluxe tier by the amount you already paid if you already own the base.