When creating a discount code, you can set this code to only apply to specific ticket types.
Using the "Applies To" section, you can uncheck the box and apply the code to specific ticket types.
*Disclaimer: Currently, when a discount code is used, it applies to an entire order even if it is designed to be used only once. This means that if a guest purchases two tickets in a single order with a discount code meant to only be used once, the code will still apply to both tickets.
However, we are working on improving this experience so that limitations on discount codes can be more manageable.