@WebRoyal, Got to be honest with you… I haven’t come across something like that before. I would imagine there would be a bit of PHP needed to make that work.
Why do you need a completed form to populate a second form?
For conversion optimization, I break forms into a two step funnel.
Usually I put:
<?=$_POST['zip_code']?>
… into a hidden field on the form on step 2 to accomplish this, but I can’t do it with Sparkle unfortunately. (Sparkle hidden fields won’t accept PHP code injections.)