I have a student database form with a sub-form that allows me to track activity per student by semester. The sub-form includes check boxes, drop-down lists and text boxes. Everything behaves properly except the text boxes. I need the text boxes in the sub-form to be mutually exclusive per semester that is entered for a particular student, but when I create a new sub-form for that student, it automatically changes the same field in the previous sub-forms to whatever the new data is. How do I stop this??