I don't know this plant - is it easy or difficult to propagate?

I would try to get a second plant: put a pot with soil under where the roots are, let them at least touch the soil or fasten down the stem with a u-shaped clip...it may just grow. Once it is solidly rooted, just clip off (just like getting extra raspberry plants or similar...).

Otherwise, I believe these are aerial roots. You could just leave it as is. Many succulents grow these.

This rhipsalis is very easy to propagate.Just keep doing what rina suggested (which is what I did)

Those roots at the segments are what the plant uses to attach to tree's..or rocks.

CharlieCharles, that plant is amazing