JSFiddle - React, Tailwind, and code Playground

HTML

<select id="if_cips_selection">
    <option value="AAT">AAT</option>
    <option value="CIPS">CIPS</option>
    <option value="CILT">CILT</option>
</select>

<select id="cips_level">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
</select>

JavaScript

$(document).ready(function() {

    $("#if_cips_selection").change(function() {
        var val = $(this).val();
        
        if (val == "CIPS") {
            $("#cips_level").html("<option value='1'>2</option><option value='2'>3</option>");
        } 
    });
});