To do a cut air-layering, you cut up at an angle through the stem 2/3rds of the way through the stem, prop the cut open with a toothpick so the stem won't close and reseal it's self. I usually put, 3 bamboo skewers or 2 popsicle sticks around the cut and twist tie them at both ends to the stem above and below the cut to keep it from being broken off due to bumping, or winds. Dust the cut with rooting hormone, surround it with moist moss, then with Saran wrap. twist tied at both ends. keep the soil lightly moist to encourage faster rooting at the cut site..