Dynamically hide a section of a sprite using another sprite

Hello, Firstly we use 2dToolKit.

I am trying to figure out how to dynamically cut out a section of sprite using another sprite. Basically I want all of the wall object to be in front of the character except the cut out section that I want invisible. The difficult part is I want to be able to dynamically place the hole, else I would just throw another layer in front to hide the player sprite.

Foreground objects -> Wall Sprite -> Character Sprite -> Hole BG -> Background Objects

Any ideas are mush appreciated.