Hi Anole,
Yes! you can grow these cacti really well from cuttings/offsets. If a limb was to fall/break off - leave it sitting around in a dry place for a few days to let the cut/break dry out and callous over. Then stick it in a pot with well draining soil and leave it be. Initially you want to really minimize/avoid watering the plant as it has no roots, once a few roots are established (you know either by seeing new growth or feeling that the cactus is more solidly stuck in the soil) you can start providing some water (or letting it catch some rain).
If you decide to put your big plant in the ground, amend the soil immediately around the plant in such a way that it drains/dries out pretty fast because long term wet feet is what will kill the plant for sure. It can definitely take lots of water, but enjoys dry feet. If you can get your hands on some pumice, you can mix that in with a part local soil, and a part well draining cactus soil and back fill whatever hole you dig for the cactus with that - you probably also will want to use some of that mixture below the cactus.
