Хотите что-то подобное?
https://codepen.io/Sachin4dotnet/pen/KxJQMX
HTML:
<!-- Button trigger modal -->
<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal1">
Launch demo modal
</button>
<!-- Modal -->
<div class="modal fade" id="myModal1" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h4 class="modal-title" id="myModalLabel">Modal 1</h4>
</div>
<div class="modal-body">
<form role="form" action='#' method="post">
<input type="text" class="form-control" placeholder="Username">
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary" id="signin">Sign In Now</button>
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</form>
</div>
</div>
</div>
<!-- Modal -->
<div class="modal fade" id="myModal2" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h4 class="modal-title" id="myModalLabel">Modal 2</h4>
</div>
<div class="modal-body">
<p>Sign In Error</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</form>
</div>
</div>
</div>
Javascript:
//trigger next modal
$("#signin").on( "click", function() {
$('#myModal2').modal('show');
});
Есть еще одинодин вариант, который лучше, но имеет больше JS / CSS - https://codepen.io/maouida/pen/NPGaaN