How to create a form with just a few fields of a Fields Group, without posting

Ah, forgot:
Is it possible to pass the values from first form to second form?

Or, in other words, how’d go for populating form fields dynamically according a previously submitted form?

I read only the post ID can be set by url param.
However it must be possible somehow to populate other fields dynamically also?

Thanks!

In case anyone stumbles on the same issues, this is how I solved it:

1. First form includes only a few fields visibly
2. It has a Custom Redirect Hook applied that does two things: Redirect to a new URL and passes certain input values to the URL, as well it deletes the post just created, as we don’t want it to be saved just yet
3. On the redirect target the final full form will allow to complete the process, and is populated by the available url parameters.

The code:
For the redirect and delete post actions:

add_filter( 'rwmb_frontend_redirect', 'my_redirect_custom_hook', 10,2);
function my_redirect_custom_hook($url, $config){
    if( $config['id'] == 'my-metabox-slug' && startsWith( $_POST['_wp_http_referer'] , '/referrer-base/' ) ){

        $url = 'site.com/target/?url_param_one=' . $_POST['metabox-field-one'] . '&url_param_two=' . $_POST['metabox-field-two'];

        wp_delete_post( $config['post_id'], true );

    }

    return $url;
}
//Helper Function since only PHP8 and above will support natively str_starts_with()
function startsWith( $haystack, $needle ) {
     $length = strlen( $needle );
     return substr( $haystack, 0, $length ) === $needle;
}

Then on the target page (final form), read the URL arguments with JS and put them in the determined fields:

jQuery( document ).ready(function($){
    function querySt(ji) {

        hu = window.location.search.substring(1);
        gy = hu.split("&");

        for (i=0;i<gy.length;i++) {
            ft = gy[i].split("=");
            if (ft[0] == ji) {
                return ft[1];
            }
        }
    }
    var url_param_one = querySt("url_param_one");
    var url_param_two = querySt("url_param_two");
    document.getElementById('metabox_field_form_id_one').value = url_param_one;
    document.getElementById('metabox_field_form_id_two').value = url_param_two;
});

It will need some more care in sanitising the url params, and of course, change the slugs and ids to the specific use cases.