changing a field's drop down list based on the value of another field
is there a way to alter the values available to a user on a drop down based on the values of another field.
I'm thinking about making a form that has a drop down list of four categories. Based on which of the four categories is chosen, the next field will give them a list of questions that are based on the first choice. So if you choose category A, your choices will be Q1, Q2, Q3. But if you choose category B your choices will be Q4, Q5. if you choose category C your choices will be Q6, Q7, Q8, Q9, and so on.
is there a way to do that?