<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<div class="row">
<form action="">
<div class="container-fluid">
	<div class="col-lg-2 col-md-2 col-sm-2 col-xs-12"></div>
	<div class="col-lg-8 col-md-8 col-sm-8 col-xs-12">
	   <div class="main_border">
		<div class="main_header_bg">jQuery Add and Remove (Bottom to Remove)</div>
		<div class="container-fluid" style="padding:10px !important;">
			<div class="input_fields_wrap">
			<div class="form-group row">
				<div class="col-md-5 col-sm-4 col-xs-12">
					<label>Name</label>
					<input type="text" class="form-control my_form" name="sample_name[]" placeholder="Name">
				</div>
				<div class="col-md-2 col-sm-2 col-xs-12">
					<label>Age</label>
					<input type="text" class="form-control my_form" name="sample_age[]" placeholder="Age">
				</div>
				<div class="col-md-4 col-sm-4 col-xs-10">
					<label>Languages</label>
					<select class="form-control my_form"  name="sample_lang[]" value="">
						<option value="">Select Language</option>
						<option value="English">English</option>
						<option value="Hindi">Hindi</option>
						<option value="Telugu">Telugu</option>
						<option value="Tamil">Tamil</option>
						<option value="German">German</option>
					</select>
				</div>
				<div class="col-md-1 col-sm-2 col-xs-2"><button class="add_field_button btn-success add_btn">+</button></div>
			</div>
			
		  </div>
		</div>
	  </div>
	</div>
	<div class="col-lg-2 col-md-2 col-sm-2 col-xs-12"></div>
</div>

</form>
</div>
.main_header_bg {
    background-color: #036;
    padding: 10px 15px;
    font-size: 14px;
    color: #FFF;
    border: 1px solid #036;
    font-weight: bold;
    margin: 0px;
    border-radius: 3px;
}

.main_border {
    border: 1px solid #036;
    border-radius: 3px;
    margin-top: 50px;
}

.border_fff {
    border-bottom: 2px solid #FFF;
}

label {
    font-weight: 600;
    margin: 20px auto -5px;
    font-size: 13px;
}

.cus_label {
    font-weight: 600;
    margin-top: 10px;
}

.my_form {
    border-radius: 0px !important;
    padding: 1px 15px !important;
    margin: 10px auto;
}

.add_btn {
    border-radius: 100px;
    font-weight: bold;
    font-size: 20px;
    padding: 0px 9px;
    border: none;
    margin: 45px 0px 0px;
}

.remove_btn {
    border-radius: 100px;
    font-weight: bold;
    font-size: 20px;
    padding: 4px 12px;
    margin: 2px 5px;
}
<script type="text/javascript"> 
	$(document).ready(function() {
	var max_fields      = 7; //maximum input boxes allowed
	var wrapper         = $(".input_fields_wrap"); //Fields wrapper
	var add_button      = $(".add_field_button"); //Add button ID
	
	var x = 1; //initlal text box count
	$(add_button).click(function(e){ //on add input button click
		e.preventDefault();
		if(x < max_fields){ //max input box allowed
			x++; //text box increment
			$(wrapper).append('<div class="form-group row"><div class="col-md-5 col-sm-4 col-xs-12"><label>Name</label><input type="text" class="form-control my_form" name="sample_name[]" placeholder="Name"></div><div class="col-md-2 col-sm-2 col-xs-12"><label>Age</label><input type="text" class="form-control my_form" name="sample_age[]" placeholder="Age"></div><div class="col-md-4 col-sm-4 col-xs-10"><label>Languages</label><select class="form-control my_form"  name="sample_lang[]" value=""><option value="">Select Language</option><option value="English">English</option><option value="Hindi">Hindi</option><option value="Telugu">Telugu</option><option value="Tamil">Tamil</option><option value="German">German</option></select></div><a href="#" class="remove_field"><span class="remove_btn btn-danger" style="margin:42px 15px; position:absolute; padding:0px 11px;">-</span> </a></div>'); //add input box
		}
	});
	$(wrapper).on("click",".remove_field", function(e){ //user click on remove text
		e.preventDefault(); $(this).parent('div').remove(); x--;
	});
});
</script>