You snip off suckers to root. Where the stalk meets a limb, in that spot where they come together, is where the sucker will start growing. Snip it off with your hand, put it in a jar of water in the house and it will root. When the roots are substantial enough to hold it in the soil, plant it.
He had examples of rooting in water and planting and just putting the sucker in the soil when you snip it off, and those rooted in water were excellent and the ones planted in the ground before rooting, were pitiful, some dead, but a few still alive.
We took cutting from some mater plants a while back and it worked great. We skipped the water part by using rooting hormone powder and planting in pots directly
I do something similar at the end of the season. I cut off the limbs that still have tomatoes and make sure I have several joints. Pick off the bottom leaves, and bury the stem in dirt, or use water.
Sometimes I use rooting powder, but not usually necessary. Pollinate by hand. Have grown tomatoes through the winter indoors using the fall cuttings.
Had pretty good success with rooting tomato branches or suckers a few inches long. My banana pepper plant had 2 branches knocked off by squirrels (your favorite pets Marcella).
Anyway i had those branches in water for over a month and nothing—not even a tiny root shoot but they did good in the water. I have one now out back in a container of water well over a month — lo and behold I’m getting a pepper growing and some buds but no root shoots. Go figure.....
On the other hand, nothing I have done has ever gotten my Climbing Triple-Crop cuttings to root, in any year that I've tried.