Stem section cuttings. Some house plants are grown from stem-section cuttings. Cut the stem into sections so that each has one or more nodes. Lay the sections flat on sand or vermiculite, and cover the bottom half. Place in moist rooting medium with the tops just above the surface.
Some plants produce new plants on their own.
You can propagate them by planting these new ones. The bryophyllum plant and some kalanchoes have this kind of leaf. This means that small plants from on the edges of the leaves. You can pick them off and pot them in a regular soil mix. A runner is along stem that produces new plants at its nodes.