Q.I Have to Bring in Two Very Large Plants
I would like advice on repotting/down sizing the plants into smaller containers to make them more managable and easier to get into the house for winter. I live in the tidewater area and the two plants have to be moved via a hand truck in and out seasonally. Rather than let them die, I want two split them up into smaller pots. Need guidance.

Certified GKH Gardening Expert
Typically, if you are downsizing a plant, you will be doing some root pruning. This article will help you with root pruning:
https://www.gardeningknowhow.com/houseplants/hpgen/prune-roots.htm
Anytime you are repotting a plant, it is susceptible to transplant shock, but even more so when you are also root pruning. This article will help you with that:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
If you can let me know what kind of plants they are, I can give you further help on how to handle splitting them.