How to customize Registration Theme with some validations Step's

I’m trying to create a custom Registration theme with 2 forms :
The first one is a validation form in wich client will put one ClientCode and one ZIPcode
If both information of the first form are validated then we have the second form a classic one.
Do you know if it’s possible to do that ?

You could use one form and show/hide the (input) controls.

See:

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