VibeThemes Support

Add this code in Child theme functions.php file :

/*-----------------------------------------------------------------------------------*/
/*	Nested Tabs Shortcodes
/*-----------------------------------------------------------------------------------*/

if (!function_exists('inside_tabs')) {
	function inside_tabs( $atts, $content = null ) {
            extract(shortcode_atts(array(
			'style'   => '',
            'theme'   => ''
	    ), $atts));
            
		$defaults=$tab_icons = array();
                extract( shortcode_atts( $defaults, $atts ) );
		
		// Extract the tab titles for use in the tab widget.
		preg_match_all( '/inside_tab title="([^\"]+)" icon="([^\"]+)"/i', $content, $matches, PREG_OFFSET_CAPTURE );
		
		$tab_titles = array();
        
		if(!count($matches[1])){ 
		preg_match_all( '/inside_tab title="([^\"]+)"/i', $content, $matches, PREG_OFFSET_CAPTURE );

		if( isset($matches[1]) ){ $tab_titles = $matches[1];}
		}else{
		if( isset($matches[1]) ){ $tab_titles = $matches[1]; $tab_icons= $matches[2];}
		}
		
		
		$output = '';
        global $random_number;
		if( count($tab_titles) ){
		    $output .= '<div id="vibe-tabs-'. rand(1, 100) .'" class="tabs tabbable '.$style.' '.$theme.'">';
			$output .= '<ul class="nav nav-tabs clearfix">';

         	foreach( $tab_titles as $i=>$tab ){
                $tabstr= str_replace(' ', '-', $tab[0]);
                $tabstr=preg_replace('/[^A-Za-z0-9\-]/', '', $tabstr);

                $check_url = strpos($tab_icons[$i][0],'http');
                if(isset($tab_icons[$i][0]) && $check_url !== flase && $check_url<2){
                	$href = $tab_icons[$i][0];
                }else{
                	$href='#inside_tab-'. $tabstr .'-'.$random_number;
	            }

				$output .= '<li><a href="'.$href.'">';
				
				if(isset($tab_icons[$i][0]))
					$output.='<span><i class="' . $tab_icons[$i][0] . '"></i></span>';

				$output .= $tab[0] . '</a></li>';
			}
		    $output .= '</ul><div class="tab-content">';
		    $output .= do_shortcode( $content );
		    $output .= '</div></div>';
		} else {
			$output .= do_shortcode( $content );
		}
		
		return $output;
	}
	add_shortcode( 'insides', 'inside_tabs' );
}

if (!function_exists('inside_tab')) {
	function inside_tab( $atts, $content = null ) { 
		$defaults = array( 'title' => 'Tab' );
		extract( shortcode_atts( $defaults, $atts ) );
		global $random_number;
		$tabstr= str_replace(' ', '-', $title);//
		$tabstr=preg_replace('/[^A-Za-z0-9\-]/', '', $tabstr);
		return '<div id="inside_tab-'. $tabstr .'-'.$random_number.'" class="tab-pane"><p>'. do_shortcode( $content ) .'</p></div>';
	}
	add_shortcode( 'inside', 'inside_tab' );
}

Now instead of using tabs shortcode like :

[tabs]

   [tab title="XXX]

       [tabs]

           [tab title="YYY"]content[/tab]

       [/tabs]

   [/tab]

[/tabs]

.......

change it to 

[tabs]

   [tab title="XXX]

       [insides]

           [inside title="YYY"]content[/inside]

       [/insides]

   [/tab]

[/tabs]