Q.Where Should I Cut This Stem To Make A New Plant?
I got this from Amazon. The seller labeled it wrong. I collect purple plants indoors. Also I’m trying to become good at indoor and outdoor gardening. I thought I had a green thumb but indoor gardening is tricky. So, I have decided to find a tutor. This plant started indoors in the wrong conditions. It is happy now outside on covered patio in Texas heat. Can I cut the long stem and acclimate the cutting to bright light inside?

Certified GKH Gardening Expert
Oh! Wow! My apologies. I must have put this answer for the wrong question! Otherwise, I would have replied appropriately. I can see as many as 200 questions per week, alone, and it is easy for me to mix things up some.
I have quite a bit of information to offer on this subject.
The best thing to do will be to cut at a node cluster, as you stated. Usually, this is anywhere from 3 to 6 inches down, but the closer to the tip the better results you will get. What really sets them and gets them going, as you have probably figured out, is rooting hormones. There are many, but you can choose to use honey, or aspirin as well. Aspirin is especially useful, since acetylsalicylic acid can be just as fast as indole 3 butyric acid.
Here are some articles that you will find useful for propagating future plants:
https://www.gardeningknowhow.com/garden-how-to/projects/rooting-plant-cuttings.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/cuttings/root-stimulating-hormone.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/cuttings/honey-root-hormone.htm

Certified GKH Gardening Expert
These will, actually, become more purple with less light. Too much light turns them green.
Here is an article that will help you to care for this plant:
https://www.gardeningknowhow.com/ornamental/flowers/rhoeo/growing-rhoeo-plants-in-the-garden.htm

I asked a specific question. I asked the same question on another gardening site and got a very helpful answer in much less time! For those interested...cut the stem off and then separate the parts of the plant that are clumped on the end. Looking closely, the shoots already have small roots. The ones that don't will just take a little longer to become a separate plant. So I have 6 new plants that have acclimated to indoor lighting. They have all rooted and are as big as the original plant now.