JSFiddle - React, Tailwind, and code Playground
by whoamiwho
HTML
<select id="dropdwon1">
<option value="1">Item1</option>
<option value="2">Item2</option>
<option value="3">Item3</option>
</select>
<select id="dropdwon2"></select>
JavaScript
$('#dropdwon1 option').clone().appendTo('#dropdwon2');