Hello I am running into a problem. I have a wall and a floor. I would like to be able to move the walls and have the floor always stretch to underneath the wall. Any ideas how to do this I tried using the constraint transform but when I moved the wall the floor would not scale equally and at some point would not be near the wall. Any help please
Can you post a screenshot of your current rig?
The simplest way is to add hooks to all four edges of the plane and then parent the hooks to the corresponding walls.
No need of transform constraints 
Wow that worked great… i had never used hooks befor and it worked perfect