@gjones @gardengirlla I didn't know that. Look what I found onlime: Overwintering Sweet Potato Vine Tubers cut the vines to ground level, then dig them up before the first frost in autumn. Dig carefully and be careful not to slice into the tubers. Brush the soil lightly off the tubers, then store them, not touching, in a cardboard box filled with peat moss, sand or vermiculite.
Place the box in a cool, dry location where the tubers won’t freeze. Watch for the tubers to sprout in spring, then cut each tuber into chunks, each with at least one sprout. The tubers are now ready to plant outdoors, but be sure all danger of frost has passed. From the Gardening Know How site