$(document).ready(function() {
    $('#dropdownadd').change(function() {

        var dropDownDiv = $('#dropdowndiv');

        // when the dropdown change set the div to empty
        dropDownDiv.html("");
        http: //codebins.com/codes/home/4ldqpb7#
        // get the selected value
        $loopcount = $(this).val();

        for (var i = 1; i <= $loopcount - 1; i++) {
            var setHtml = "";

            // this adds textboxes using dropdown menu but inserts 
            // the same number set into each set of textboxes
            setHtml = '<div class="form"><form id="frm' + i + '">';
            setHtml += '<label>Mitreisender ' + i + '</label>';
            setHtml += '<div class="inputs">';
            for (var t = 0; t < 1; t++) {
                setHtml += '<input type="text" name="num' + t + '" id="num' + t + '" class="input" placeholder="1"/>';
                setHtml += '<input type="text" name="num' + t + '" id="num' + t + '" class="input" placeholder="2" />';
                setHtml += '<input type="text" name="num' + t + '" id="num' + t + '" class="input" placeholder="3"/>';
            }
            setHtml += '</div>';
            setHtml += '</div>';
            dropDownDiv.append(setHtml);
        }

        var globalRefresh = dropDownDiv.append(globalRefresh);
    });

    $("#reset").click(function() {
        $("#dropdownadd").val('0');
        $("#dropdownadd").trigger('change');
    });
});

Setting Validate Copy Format

body {
  background: #fdfdfd;
  font-family: Helvetica;
}

.heading {
  font-size: 14px;
  color: #333;
}

#dropdowndiv {
  
}
.form form{
  border:1px solid #eaeaea;
  margin-bottom:5px;
  padding:5px;
  background:#eee;
  /*background-image: -webkit-linear-gradient(top, #eee, #ddd 70%);
  */
  border-radius: 2px;
  box-shadow: 0 1px 1px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.2);
}
.form label{
  float: left;
  padding: 0 0 0 2px;
  font-size:14px;
  line-height: 25px;
  color:#666;
  text-transform: uppercase;
}

.action{
  float: right;
}
.button {
  border: 1px solid #7B9;
  background-color: #8CA;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0));
  -webkit-transition: background-color 0.1s ease-in-out;
}
.button:hover {
  cursor: pointer;
  background-color: #a7ed99;
}

.form .inputs {
  clear: both;
}
.form .input{
  box-sizing: border-box;
  width: 33.3333%;
  padding: 14px 0;
  background: #fafafa;
  font-size: 32px;
  text-align: center;
  border: 1px solid #f5f5f5;
  border-left-width: 0;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.5);
}
.form .input:nth-child(1) {
  border-radius: 4px 0 0 4px;
}
.form .input:nth-child(3) {
  border-radius: 0 2px 2px 0;
  border-right-width: 0;
}

#global-refresh {
  margin: 4px 8px 20px 0;
}

Setting Validate Copy Format