You can also use javascript to trigger form elements… here’s an example of a form which “changes” based on whether the amount is fixed or “other”…
http://cssway.thebigerns.com/workbench/dynamic-form-example/
basically switching the display property for the item id. Crude, but effective.
Validating forms elements that depend on user interaction would likely be nightmarish so best if you put a lot of thought into the kinds of demands your form will require beforehand-- it may be that two forms would be less complicated.
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