Booking a flight for a resident and non-resident

I want to book a flight for 2 people. I am eligible for a discount due to my residency, but my partner is not, but there seems to be no way to select that I want to apply the residency discount only to myself, and it asks for residency certificate for both of us. Am I missing something, or do I have to book the flights separately?

https://preview.redd.it/77ys8mbvp6zg1.png?width=922&format=png&auto=webp&s=a5a023d43f7b309fdf80529b5efd1aa0bbe33392