JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td><button type="button" onclick = "addField(this)">Add more equipment</button></td>
    </tr>

JavaScript

window.addField = function addField(btn) {

            var parentRow = btn.parentNode.parentNode;
            var table = parentRow.parentNode;
            var rowCount = table.rows.length;

            var row = table.insertRow(rowCount);

            var cell3 = row.insertCell(0);

            var cell1 = row.insertCell(1);
            var element1 = document.createElement("input");
            element1.type = 'text';
            element1.class = 'qty';
            element1.id = 'quantity';
            element1.value = 0;
            cell1.appendChild(element1);

            var cell2 = row.insertCell(2);
            var element3 = document.createElement("button");
            element3.class = 'qtyminus';
            element3.type = "button";
            element3.innerHTML = "+1";
            element3.setAttribute('field', 'quantity');
            cell2.appendChild(element3);

            var cell4 = row.insertCell(3);
            var element4 = document.createElement("button");
            element4.setAttribute('field', 'quantity');
            element4.class = 'qtyplus';
            element4.type = "button";
            element4.innerHTML = "-1";
            cell4.appendChild(element4);

            var my_form = document.createElement('form');
            my_form.name = 'myForm';
            my_form.method = 'post';
            my_form.action = 'equipment_page_admin.php';




            var element2 = document.createElement("select");
            //element2.type = "select";
            var option1 = document.createElement("option");
            option1.innerHTML = "---Please Select Equipment---";
            option1.value = "default";
            element2.add(option1, null);
            var option2 = document.createElement("option");
            option2.innerHTML = "120-130 BBL Vacuum Truck (Blackiron)";
            option2.value = "120-130 BBL Vacuum Truck (Blackiron)";
            element2.add(option2, null);
            var option3 =...