The rule builder UI for BBE and delivery rules is better and is newer. It would certainly be nice to swap price books to use this as well. However, it still doesn’t get around the issue. For an order with 2 kegs and 2 casks, there would be no way to say that the first rule which fits the 2 casks should be discarded even though it fits the requirements. The same would happen in reverse if you were to reverse the ordering of the rules. In its current state, this very much fits into the realm of a person being capable of deciding the overall discount that fits, but there being no logical way to program a computer to “decide” that the first rule that fits should be ignored. So I’m afraid there is no workaround to this, I’m really sorry, Gemma!