Bootstrap Snippet add remove select to list elements using HTML CSS Bootstrap jQuery

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
    <div class="row">
        <div class="col-xs-12 col-sm-8 col-md-6">
            <form>
                <div class="row">
                        <div class="form-group">
                            <label>New Item:</label>
                            <select name="categoria" id="add" > 
                                 <option value="0">Seleccione Categoria..</option>
                                 <option value="1">CATEGORIA 1</option>
                                 <option value="6">CATEGORIA 2</option>
                                 <option value="5">CATEGORIA 3</option>
                                 <option value="4">CATEGORIA 4</option>
                            </select>
                             <select name="nivel" id="addNivel" > 
                                 <option value="0">Sin Nivel</option>
                                 <option value="1">A</option>
                                 <option value="2">B</option>
                                 <option value="3">C</option>
                                 <option value="4">D</option>
                                 
                            </select>
                            <input type="button" id="addbtn" name="addbtn" value="Add" class="btn btn-primary btn-sm" />
                        </div>
                </div>
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.container-listado {
    background-color: #e8e8e8bf;
    width: 100%;
    max-height: 200px;
    overflow: auto;
    padding-top: 1em;
    padding-right: 1em;
    padding-left: 1em;
}
.list-group-item {
    position: relative;
    display: block;
    padding-top: 0.3em !important;
    padding-bottom: 0.3em !important;
    margin-bottom: -1px;
    background-color: #fff;
    border: 1px solid rgba(0,0,0,.125);
}
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var listarr = [];
$(document).ready(function(){
    $('#addbtn').click(function(){
        var newitem =$('#addNivel').val()==0?  $('#add :selected').text():$('#add :selected').text() +" - "+ $('#addNivel :selected').text(); 
        var newitemID =$('#addNivel').val()==0?  $('#add :selected').val():$('#add :selected').val() +" - "+ $('#addNivel :selected').val(); 
    
        var uniqid = Math.round(new Date().getTime() + (Math.random() * 100));
        $('#list').append('<li id="'+uniqid+'" class="list-group-item"><input type="button" data-id="'+uniqid+'" class="listelement" value="X" /> '+newitem+'<input type="hidden" name="listed[]" value="'+newitem+'"></li>');
        $('#add').val(0);
        $('#addNivel').val(0);
        return false;
    });
    $('#list').delegate(".listelement", "click", function() {
        var elemid = $(this).attr('data-id');
        $("#"+elemid).remove();
    });
});
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"add remove select to list elements"
Bootstrap 4.0.0 Snippet by evargas

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"add remove select to list elements" Bootstrap 4.0.0 Snippet by evargas

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"add remove select to list elements"
Bootstrap 4.0.0 Snippet by evargas