You can purchase salmon filets individually or buy a whole center cut salmon and cut them yourself. Be sure to cut into filets while the fish is raw.
Store leftover dill salmon in an air-tight container kept in the refrigerator for 3-4 days.
For reheating, it's best to do so at a low temperature in the oven. I would recommend preheating the oven to 300F, placing the filets on a baking sheet, and reheating for around 10-15 minutes or until warmed through. You don't want to rush the process of reheating salmon as it can dry out rather quickly.