I am trying to create a sales sheet so that when my broker selects a finish (i.e. color of the cabinets) in one cell, by placing a "x" in the corresponding cell, there is a prompt that comes up saying that no more selections can be made. I also don't want the broker to be able to insert another x in any of the other cells (in this case two other finish selections) for a total of 3 options. Your help is greatly appreciated.