I would like to see a new promotion where you can have a spend for amount condition and exclude it on unit level.

The use case we want to support is this:

We have two promotions that exclude each other:

1.  20% off on [Pro Episerver Commerce Creating powerful eCommerce solutions]
2.  Spend for 100$ and get 10% off on [Books]

With unit level exclusion this should result in:

1. 20% off on [Pro Episerver Commerce / Creating powerful eCommerce solutions]
2. 10% off on [Episerver Commerce: A problem - solution approach / Solving problems, one at a time]

Provided we buy for 100$ or more.

It would be preferable if the discounted price for [Pro Episerver Commerce / Creating powerful eCommerce solutions] is used to calculate the 100$ and [Episerver Commerce: A problem - solution approach / Solving problems, one at a time] isn't counted at all, but that might not be necessary for all clients/use cases.