Option for Discount codes applying only to Primary service

In Spectora, when a client purchases multiple stand alone services, we can have a discount code apply only once to that order because we use a parent service that is $0 to hold all the stand alones.

In Attik it would be great if there was an option to ‘apply discount to primary service only’ so that the discount amount is applied only once to an order rather that to each of the stand alones the client gets.