I'm looking to add a checkbox to ensure the customer has read the sizing guide before proceeding. I only need this to be activated if they order a specific product and not after completing the whole form. Is this possible? It is for a Butchers shop order form. Because of the many variables available i have left an open text box and not a multiple choice. I'm concerned that some customers will not give all the information i require to complete the order so have added a link to a sizing guide. After placing an order for beef (and only beef, do not require this checkbox on any other item) i would like a check box to appear which ask if they are happy to proceed and have they read the sizing guide for help. Ideally they would not be able to proceed without this validation. I hope this makes sense. Kind regards, Gary.