Their vines, so cuttings might not work so great although it is possible. The best thing to do is to save the seeds. When the flower dies, it will produce a seed pod. Save them for next spring & plant them where you want. They are vigorus & if they get enough sun will grow just about anywhere.
Are these the larger blue flower variety, or the small white ones? The latter (small white) grow like weeds. I had soil added to my garden 4 years ago, that had bits of the roots of these in it. Still today, I find the thing sprouting up, choking out other plants. The larger blue flower variety I have had success with cuttings -- about half of them survived.