Yes this is the way to do it! The site that I use has certain sailings where it is a group rate, and I booked an inside guarantee in May 2024 for two of us for 2290 all in, taxes port fees etc. (not gratuities though). We also have a Feb 2025 cruise for 2700, ocean view where we picked our own cabin. We had the 2025 booked first and i was too excited I can’t wait that long so went back and also booked the May 2024.