How to change the dropdown values based on other dropdown in itext pdf or in any other?

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How to change the dropdown values based on other dropdown in itext pdf or in any other?

rrr
 How to change the drop down values based on another drop down?

For eg: If we select one county, that related states only come, if we select one state that state related postal code only come in editable pdf form..

please provide some suggestions how to do this..

thanks in advance..