Systems Management

I have specific template fields (Staff or student, student email, etc.) are set up to only appear when a relevant category is selected.  If the user making the service desk ticket selects another category with those template fields filled in, the conditional filters in the ticket template takes them away, but it keeps in information.  Meaning if someone were to put in data irrelevant to the ticket they were trying to submit(For this example, someone selects a student, and inputs a student email, then changes their category to something that no longer requires a student email), changed their ticket category to something else, then submitted it, the irrelevant information would still be present, even searchable.
Is it possible to set up the template so that if a field with a conditional filter is no longer visible/is filtered out at the ticket's submission, its information is erased from the field?