you can technically take a cutting from a flowering plant.
Although it will take longer till its ready to be transplanted. It is not recommended to take cuttings from flowering plants, this is due to the fact that you have to force the plant to start green leafy growth. Up until this point its been putting all its efforts into producing bud, and those hormones are hard to counter act. It's possible and i've seen people do it but might take a lot longer than usual. Hope this helps.
peace and positive energy to you