Sometimes you want to specify exactly which products to exclude: Not all products below $50, but only the ones that are from a certain brand and product type. That is why you can set multiple conditions in your Exclude tab and be as exact as you want to be.
See the rules below:
The first 'block' of rules lets you exclude all Nike – Basketball products below $50:
You can add as many rules as you want and each rule can have as many conditions as necessary.
Mind you: a rule with multiple conditions means that each condition (within that rule) has to be met, in order for the rule to apply.
Also see: 4 reasons why you should optimize your feed