Q.severed virginia creeper
Can a Virginia creeper repair itself after the main woody has been severed and rejoined? Have accidentally severed main woody stem of a Virginia creeper. Have secured the ends together but will it regrow?

Your Virginia Creeper will likely be just fine growing from the root that is still in the ground.
The severed stem can be propagated to start a new plant.
You will not be able to attached the cut stem to the main plant and regrow.
Here are some links to help you.
https://www.gardeningknowhow.com/ornamental/vines/virginia-creeper/virginia-creeper-maintenance.htm
https://www.gardeningknowhow.com/garden-how-to/projects/rooting-plant-cuttings.htm