I'd like the field type to change for a few fields in a form depending upon user input. For example, if a Status field is set to "Trial", I'd like Total Words Per Month to be a Number field (to be manually entered), but if the Status field is set to "Ongoing", I'd like Total Words Per Month to be a formula (which adds up two other fields within the form).

Is this possible, and if not, what can I do instead?

Thanks!