Propagation is the process of producing new plants from the plants you already have. In the wild, propagation from seeds is the most common method. This is achieved from flowering, pollination, fertilization, and eventually seed formation.
Many cacti can be propagated successfully by stem cuttings. This stem cutting is taken from an existing mature plant, then allowed to dry and callous. You can pot the cutting or plant it directly in the soil in your garden if the climate permits.
Read more: https://succulentplantcare.com/how-to-easily-root-and-propagate-a-cactus/