Which one?
Layering works for most of them.

I agree layering works for most.
peg a stem down into a pot of soil/compost and in about a month it should have rooted. if you find a bit of stem that has a branching bit or a joint where leaves come from it then this will root better. Scratch a bit of the bark back so that it will encourage new growth of roots.

I find that both the ones I have root this way naturally.

Thanks— l’ll try that. Previously l’ve taken cuttings, without success!

Layering works, especially for the climbing kinds, but depends on the variety - Jasmine humile is readily propagated from soft cuttings around May/June, not so much from layering.

Thank you for the additional tip, Bamboo.