Is it possible to use this one plant to grow several pots of citronella geranium plants?
Your plant is basically a pelargonium (colloquially called geraniums) with a lot of lemony scent. So the propagation process is the same as for other geraniums: make cuttings from new growth, dip the ends in rooting hormone (optional) and stick them in soil.
From experience, the scented types are a bit fussier to propagate than the decorative P. grandiflorum hybrids that were bred for exuberant flowers and more vigorous growth. But it’s absolutely doable with them as well. You may need a bit more patience as the slower-growing scented geraniums push fewer new branches than the P. grandiflorums, giving you less material to work with.