It looks like from a discount perspective I can apply discounts at the category level and then the products inherit the discount from the category.
In most e-comm platforms there also exists the concept of an order level discount that is not tied to the product but to the cart. I might be missing something but it does not look like Foxy Cart supports order level discounts. These are the types of promos I would want to run:
$ / % off
$ / % off with a minimum threshold
Free Shipping with minimum threshold
Free Product with a minimum threshold
Those are the basics then add these options:
All users get it no promo code required
Promo code required
Limit # of Redemptions total
Limit # of redemptions per customer
I am getting around it by applying a flat % discount to my default category and applying to all products but that is not ideal.