JSFiddle - React, Tailwind, and code Playground
HTML
<select id="mySelect">
<option value="1">First</option>
<option value="2">Second</option>
<option value="3">Third</option>
</select>
JavaScript
var select = null;
var COUNT = 3;
var new_id = '';
var original_id = 'mySelect';
for (i = 1; i <= COUNT; i++) {
new_id = original_id+'-Copy-'+i;
$('#'+original_id+' option').clone().appendTo($('<select id="'+new_id+'">').appendTo('body'));
}