[Solved] show only a given level in nav menu

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You need to extend Walker_Nav_Menu in such a way that it only outputs, if I understand you, items that are not “zero” depth– top level.

class my_extended_walker extends Walker_Nav_Menu {
  function start_lvl(&$output, $depth, $args ) {
    if (0 !== $depth) {
      parent::start_lvl($output, $depth, $args);
    }
  }

  function end_lvl(&$output, $depth, $args) {
    if (0 !== $depth) {
      parent::end_lvl($output, $depth, $args);
    }
  }

  function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    if (0 !== $depth) {
      parent::start_el($output, $item, $depth, $args, $id);
    }
  }

  function end_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    if (0 !== $depth) {
      parent::end_el($output, $item, $depth, $args, $id);
    }
  }
}
// testing
wp_nav_menu( 
  array( 
    'walker'=>new my_extended_walker(),
    'menu' => 'mymenu'
  ) 
);

1

solved show only a given level in nav menu