JSFiddle - React, Tailwind, and code Playground

HTML

<select class="inputreq" id="qty" name="qty">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
    <option value="4">4</option>
<option value="2">5</option>
<option value="3">6</option>
</select>

JavaScript

var optioneValue = 3;  // example 
$("#qty option").hide();
$("#qty option:lt(" + optioneValue + ")").show();