I have a wisteria bed that is growing well but I want to try to grow some smaller plants for a friend of mine because she has had trouble finding them at local nurseries.
Absolutely! This task is easily completed with a few steps. This article will explain:
https://www.gardeningknowhow.com/ornamental/vines/wisteria/propagating-wisteria-cuttings.htm
This collection of articles will give you more information on wisteria:
i have a wisteria against a wall which flowered every year,we then had to cut it back for painters and since then for the last 7 years it has never flowered why?
This article should help:
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm
Vine is over 50 years old
That is a very old specimen! Even with perfect care, this is quite the achievement! Some can live just a little longer, but this is likely the beginning of the end for the vine.
It sounds like you have a handle on the care of your Wisteria, but here is an article for some information to see the plant out in its best condition.