Как при клике по дочернему li не сворачивать родительский ul jquery

$(function() {
  $('.accordion li').click(function(event) {
    let sub = $(this).find('.submenu');
    let sub2 = $(this).find('.submenu2');
    $('.accordion li .submenu').not(this).slideUp(600)
    if ($(sub).hasClass('active')) {
      alert('remove active');
      $(sub).slideUp(600).removeClass("active");
    } else $(sub).slideDown(600).toggleClass("active");

    $(sub).find('li').click(function(e) {

      $(this).find(sub2).slideDown(600);

    });
  });

});

  * {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  background: #2d2c41;
  font-family: 'Open Sans', Arial, Helvetica, Sans-serif, Verdana, Tahoma;
}

ul {
  list-style-type: none;
}

a {
  color: #b63b4d;
  text-decoration: none;
}


/** =======================
   * Contenedor Principal
   ===========================*/

h1 {
  color: #FFF;
  font-size: 24px;
  font-weight: 400;
  text-align: center;
  margin-top: 80px;
}

h1 a {
  color: #c12c42;
  font-size: 16px;
}

.accordion {
  width: 100%;
  max-width: 360px;
  margin: 30px auto 20px;
  background: #FFF;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  border-radius: 4px;
}

.accordion .link {
  cursor: pointer;
  display: block;
  padding: 15px 15px 15px 42px;
  color: #4D4D4D;
  font-size: 14px;
  font-weight: 700;
  border-bottom: 1px solid #CCC;
  position: relative;
  -webkit-transition: all 0.4s ease;
  -o-transition: all 0.4s ease;
  transition: all 0.4s ease;
}

.accordion li:last-child .link {
  border-bottom: 0;
}

.accordion li i {
  position: absolute;
  top: 16px;
  left: 12px;
  font-size: 18px;
  color: #595959;
  -webkit-transition: all 0.4s ease;
  -o-transition: all 0.4s ease;
  transition: all 0.4s ease;
}

.accordion li i.fa-chevron-down {
  right: 12px;
  left: auto;
  font-size: 16px;
}

.accordion li.open .link {
  color: #b63b4d;
}

.accordion li.open i {
  color: #b63b4d;
}

.accordion li.open i.fa-chevron-down {
  -webkit-transform: rotate(180deg);
  -ms-transform: rotate(180deg);
  -o-transform: rotate(180deg);
  transform: rotate(180deg);
}


/**
   * Submenu
   -----------------------------*/

.submenu {
  display: none;
  background: #444359;
  font-size: 14px;
}

.submenu li {
  border-bottom: 1px solid #4b4a5e;
}

.submenu a {
  display: block;
  text-decoration: none;
  color: #d9d9d9;
  padding: 12px;
  padding-left: 42px;
  -webkit-transition: all 0.25s ease;
  -o-transition: all 0.25s ease;
  transition: all 0.25s ease;
}

.submenu a:hover {
  background: #b63b4d;
  color: #FFF;
}

.submenu2 {
  display: none;
}

.submenu2 a {
  display: block;
  text-decoration: none;
  color: #d9d9d9;
  padding: 12px;
  padding-left: 62px;

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul id="accordion" class="accordion">
  <li class=".accordeon-content">
    <div class="link"><i class=""></i>Text</div>
    <ul class="submenu">
      <li><a href="#">Text</a>
        <ul class="submenu2">
          <li><a href="#">1</a></li>
          <li><a href="#">2</a></li>
          <li><a href="#">3</a></li>
        </ul>
      </li>
      <li><a href="#">Text</a>
        <ul class="submenu2">
          <li><a href="#">1</a></li>
          <li><a href="#">2</a></li>
          <li><a href="#">3</a></li>
        </ul>
      </li>
    </ul>
  </li>
</ul>