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(".content").append('<ul class="pricepart"><li><input type="text" /></li></ul>');
});