Q.pencil cactus
My plant has shown no growth since I brought it inside. I cut way back on the watering as per directions fron web. After 3 weeks of so, the newly developing leaves begin to turn brown like they are dying. Water them, they green up. I was hoping they would grow some over the winter.
I also have had no luck with cuttings taking root. I must be missing something.

Your plants growth will slow considerably during winter and it's dormant period of rest. As the weather warms you can began watering and increase the light that your plant is receiving.
Make sure the soil is well draining.
Here is an article that will refresh you on the care and also information on rooting cuttings.
https://www.gardeningknowhow.com/ornamental/cacti-succulents/pencil-cactus/care-pencil-cactus.htm