I have developed a costing model for our products. It includes a radio button that you can select if the product is put on a skid or not. This triggers several calculations that affect time to produce the product and other things as well. Due to the length of some of our products we cannot skid anything longer than 144". I was wondering if there is a way to lock the radio button in the "No Skid" position if the entered length of the product is greater than 144".