JSFiddle - React, Tailwind, and code Playground

HTML

<form name="myform">
    <div align="center">
        <p>Prompt Category:
            <select name="optone" size="1" onchange="setOptions(document.myform.optone.options[document.myform.optone.selectedIndex].value);">
                <option value="Prompt Category" selected="selected"></option>
                <option value="1">Advertisement</option>
                <option value="2">Asked to Call / Call Back</option>
                <option value="3">Bank / Card Debited</option>
                <option value="4">Checked Bill / Balance</option>
                <option value="5">Consult Call</option>
                <option value="6">Customer Desire</option>
                <option value="7">Customer Going Abroad</option>
                <option value="8">Loss/Theft</option>
                <option value="9">Needed Instruction</option>
                <option value="10">Promise Not Forfilled</option>
                <option value="11">Promoted on Call by Advisor</option>
                <option value="12">Promotion Not Received</option>
                <option value="13">Received Communication</option>
                <option value="14">Receiving Nuisance Calls</option>
                <option value="15">Unable to Self-Serve</option>
                <option value="16">Unable to Use Accessory</option>
                <option value="17">Unable to Use Device</option>
                <option value="18">Unable to Use Service</option>
                <option value="19">Wanted Confirmation</option>
            </select>
            <br />
            <br />Prompt Detail:
            <select name="opttwo" size="1">
                <option value="Please Select Prompt Category" selected="selected">Please Select Prompt Category</option>
            </select>
        </p>
        <p>
            <input type="button" name="go" value="Submit">
        </p>
    </div>
</form>

JavaScript

function setOptions(chosen) {
    var selbox = document.myform.opttwo;
    selbox.options.length = 0;
    if (chosen == " ") {
        selbox.options[selbox.options.length] = new Option('Please Select Prompty Category', ' ');

    }
    if (chosen == "1") {
        selbox.options[selbox.options.length] = new Option('123213123123', 'oneone');
        selbox.options[selbox.options.length] = new Option('23123123123', 'onetwo');
    }
    if (chosen == "2") {
        selbox.options[selbox.options.length] = new Option('23121312312', 'twoone');
        selbox.options[selbox.options.length] = new Option('3211231232', 'twotwo');
        selbox.options[selbox.options.length] = new Option('2131223213', 'twothree');
        selbox.options[selbox.options.length] = new Option('32123213213', 'twofour');
    }
    if (chosen == "3") {
        selbox.options[selbox.options.length] = new Option('Not Applicable', 'threeone');
    }
    if (chosen == "4") {
        selbox.options[selbox.options.length] = new Option('Not Applicable', 'fourone');
    }
    if (chosen == "5") {
        selbox.options[selbox.options.length] = new Option('23213123123', 'fiveone');
        selbox.options[selbox.options.length] = new Option('2312132312', 'fivetwo');
        selbox.options[selbox.options.length] = new Option('12312123213', 'fivethree');
        selbox.options[selbox.options.length] = new Option('21213231321', 'fivefour');
        selbox.options[selbox.options.length] = new Option('213213213', 'fivefive');
        selbox.options[selbox.options.length] = new Option('23213132123', 'fivesix');
    }
    if (chosen == "6") {
        selbox.options[selbox.options.length] = new Option('Not Applicable', 'sixone');
    }
    if (chosen == "7") {
        selbox.options[selbox.options.length] = new Option('Not Applicable', 'sevenone');
    }
    if (chosen == "8") {
        selbox.options[selbox.options.length] = new Option('Not Applicable', 'eighone');
    }
    if (chosen == "9") {
       ...