Medley copyright issues

We are now required to note if our scores are original pieces, and if not, what they are based off. What are we supposed to do with medleys? I have several arrangements which are medleys, including one with 6 different songs and another which is from one public domain and one non-PD composition. How are we supposed to mark this? There doesn't seem to be a way to indicate multiple works. Do I just list one? Do I consider it an original composition?