An orchid like a Phalaenopsis can’t be propagated using a flower stem cutting. That doesn’t mean stem cuttings are out, though!
Dividing an orchid involves separating the rhizome. To propagate an orchid through division, make sure you’ve got a healthy, adult plant with plenty of canes/pseudobulbs.
‘Keiki’ is a Hawaiian word meaning baby or child. As you can imagine, you’re in luck if your orchid grows a keiki.
Some orchids, such as Cymbidiums, have pseudobulbs on their canes. These are used to store nutrients or water.