JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
<ul class="pricepart">
<li>
<input type="text" />
<span class="add">ADD+</span> 
</li>
</ul>
</div>
<div class="content">
<ul class="pricepart">
<li> <input type="text" />
<span class="add">ADD+ </span></li>
</ul>
</div>

JavaScript

$(".add").click(function () {
  $(this).parents().eq(2).append('<ul class="pricepart"><li><input type="text" /></li></ul>');
});