How to display a three-level menu through pdoMenu?

Question

MODX

Hello! Guys, do not kick, just did not find anything on this issue.
Please tell me how to display a three-level menu through pdoMenu.
The menu is like this

<nav>
            <ul class="topmenu">
              <li><a href="" class="active">Главная<span class="fa fa-angle-down"></span></a>
                <ul class="submenu">
                  <li><a href="">меню второго уровня</a></li>
                  <li><a href="">меню второго уровня<span class="fa fa-angle-down"></span></a>
                    <ul class="submenu">
                      <li><a href="">меню третьего уровня</a></li>
                      <li><a href="">меню третьего уровня</a></li>
                      <li><a href="">меню третьего уровня</a></li>
                    </ul>
                  </li>
                  <li><a href="">меню второго уровня</a></li>
                </ul>
              </li>
              <li><a href="">Компания</a></li>
              <li><a href="">Блог</a></li>
              <li><a href="">Контакты</a></li>
            </ul>
          </nav>

css

nav {background: #413F3C;}
nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
nav ul:after {
  content: "";
  display: table;
  clear: both;
}
nav a {
  text-decoration: none;
  display: block;
  transition: .3s linear;
}
.topmenu > li {
  float: left;
  position: relative;
  border-left: 1px solid black;
}
.topmenu > li:first-child {border-left: 0;}
.topmenu > li > a {  
  padding: 20px 30px;
  font-size: 12px;
  text-transform: uppercase;
  color: #FEFDFD;
  letter-spacing: 2px;
}
.topmenu > li > a.active, 
.submenu a:hover {color: #ddbe86;}
.topmenu .fa, 
.submenu .fa {
  margin-left: 5px;
  color: inherit;
}
.submenu {
  position: absolute;
  z-index: 5;
  min-width: 200px;
  background: white;
  border-top: 1px solid #CBCBCC;
  border-left: 1px solid #CBCBCC;
  border-right: 1px solid #CBCBCC;
  visibility: hidden;
  opacity: 0; 
  transform-origin: 0% 0%;
  transform: rotateX(-90deg);
  transition: .3s linear;  
}
.submenu li {position: relative;}
.submenu li a {
  color: #282828;
  padding: 10px 20px;
  font-size: 13px;
  border-bottom: 1px solid #CBCBCC;
}
.submenu .submenu {
  position: absolute;
  left: 100%;
  top: -1px;
  transition: .3s linear;
}
nav li:hover > .submenu {
  transform: rotateX(0deg);
  visibility: visible;
  opacity: 1;
}

Answer 1

Yes *era you were looking for? We must already learn to raise our butt from the krels and search-search ..
This is solved by templates for nested levels ...
https://modx.pro/help/5212/
Question to the bathhouse !!!