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If the stems are still alive, it will regrow its leaves. I would check the stems and if they are still alive, care for the plant as you normally would and you should see leaves start to grow in a few weeks. Also, I would take precautions to protect the plant from the cold, making sure to bring it indoors over winter.

These articles will help you as well:
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm

You can cut off the tops and the plant will put out side shoots to compensate for the pruning. The branch you cut will not grow any longer, but other branches will develop to take its place for height of the plant.

There a few things that can cause this. This article will help:
https://www.gardeningknowhow.com/houseplants/rubber-tree/rubber-tree-plant-leaves-falling-off.htm

Rubber trees are generally hardy outdoors in Zones 10-11 where temperatures do not fall below 30 degrees F. It would definitely be a good idea to bring the plant indoors for overwintering unless you can ensure that it's adequately protected. Indoor temps of at least 60 degrees F. are ideal over winter.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/houseplants/rubber-tree/rubber-tree-plant-leaves-falling-off.htm

Cuttings are best started in soil. Here is an article that can help: https://www.gardeningknowhow.com/houseplants/rubber-tree/propagation-rubber-tree-plant.htm