JSFiddle - React, Tailwind, and code Playground

HTML

<select data-placeholder="Choose cars..." class="chosen-select" name="myselect[]" id="myselect" multiple>   
<option value="1">Vauxhall</option>                                                                                          
<option value="2">Volvo</option>
</select>
<select name="secondSelect" id="secondSelect">
    <option value="">Select Model</option>
</select>

JavaScript

$('#myselect').change(function() {
        $('#secondSelect').html('');
        jQuery.each($("option:selected",this), function(i, val) {
            $('#secondSelect').append($(val).clone());
        });
});