Certified GKH Gardening Expert
These guys are VERY forgiving of their environment. You can ,literally, take any piece of the cactus, and root it into its very own plant. Most of the time this can be achieved without hormone. A mixture of honey, water, and and aspirin tab will be your best bet with rooting hormone.
Here is an article for further care on the cactus:https://www.gardeningknowhow.com/ornamental/cacti-succulents/epiphyllum/epiphyllum-plant-care.htm