Certified GKH Gardening Expert
There is no need to. Root pruning only needs to be done if you are putting it back into the same container and trying to keep it smaller. Otherwise, just repot without disturbing the roots much.
If you are forcing them into dormancy, you will want to wait until all growth is dead before you remove the plants. There will be nothing but dead material to pull off, and sometimes not even that if it is left long enough to fall off. Then you can begin storage. If this is an emergency storage, then you can cut foliage an roots if needed. It is best to let them go naturally if possible, though.
This article will help: https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/storing-elephant-ear-bulbs.htm
This will help you to grow them, if you choose to winter them as houseplants, instead.https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ears-indoors.htm