Mings can be propagated by tip cuttings. Take several green cuttings (older, woody stems are better propagated by air-layering) of about 5-6", pot them together in a small pot with dampened sterile, peat-base potting mix, tent the cuttings in a plastic bag into which you've blown air, then seal and place the cuttings in a warm, bright location. Plastic tenting retains the humidity necessary for the leaves to survive until roots form. To lessen the risk of fungal infections, ensure the plastic bag is large enough that the leaves don't touch the the plastic once filled with air. Should condensation form within the tent, open it long enough to lower the humidity, then reseal after refilling with air. Check the soil regularly and water only if necessary (soil should be damp but not soggy). Once new growth appears (about 5-8 weeks, perhaps longer this time of year), gradually remove the tenting over several days.

Patience is key and remember Mings are not the easiest plants to propagate, so don't be discouraged if you don't first succeed. Best of luck!