<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<style>
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="form-group col-md-3">
<select class="form-control" id="one">
<option>Select Box 1</option>
<option value="f1">Click here to go next step</option>
<option>3</option>
<option>4</option>
</select>
</div>
<div class="form-group col-md-3">
<select class="form-control" id="two" style="display: none;">
<option>Select Box 2</option>
<option>1</option>
<option value="t1">Click here to go next step</option>
<option>3</option>
<option>4</option>
</select>
</div>
