How do I set my logic not to perform any discounts or alteration when none of the conditions is found to be true?

How do I set my logic not to perform any discounts or alteration when none of the conditions is found to be true?

For this, you need to set the default expression as the field's name whose value is returned when none of the conditions is met. For example, a Total Payment Amount field can be kept as the default expression when none of the discounts are processed.