메인메뉴가 (홈 / 회사소개/ 제품/ 커뮤니티) 로 구성되어있을때

회사소개를 선택하면  왼쪽 사이드바 영역에 메인메뉴 소스를 이용하여 서브메뉴를 만들어주려고 합니다.

메인메뉴 부분에서  선택된 해당 메뉴 부분만 가져오면 될거 같은데 가능 할까요?

제가 초보라  문법을 전혀 이해못하겠습니다. ㅠㅠ  (아래의 언어가 무슨 언어인가요?)

고수님들 죄송하지만  답변 부탁드립니다. 

(아래는 메인 메뉴 의 소스 입니다)

<ul id="main_nav">   
            <block loop="$main_menu->list=>$key,$val">
            {@ $menu_depth1 = $val }
            <block cond="$val['selected']">{@ $menu_1st = $val }</block>
            <block cond="$val['link']">
            <li><a href="{$val['href']}" onclick="window.open(this.href);return false;"|cond="$val['open_window']=='Y'" class="on"|cond="$val['selected']"><span>{$val['link']}</span></a>
               
                <!--// main_menu 2차 시작 --> 
                <block cond="$menu_depth1['list']">
                <ul>
                    <block loop="$menu_depth1['list']=>$key,$val">
                    {@ $menu_depth2 = $val }
                    <block cond="$val['link']">
                    <li class="on"|cond="$val['selected']"><a href="{$val['href']}" onclick="window.open(this.href);return false;"|cond="$val['open_window']=='Y'">{$val['link']}<block cond="$menu_depth2['list']"><img src="img/{$layout_info->colorset}/arrow-down.png" alt="" class="arrow" /></block></a>
                   
                        <!--// main_menu 3차 시작 -->
                        <block cond="$menu_depth2['list']">
                        <ul>
                            <block loop="$menu_depth2['list']=>$key,$val">
                            {@ $menu_depth3 = $val }
                            <block cond="$val['link']">
                            <li class="on"|cond="$val['selected']"><a href="{$val['href']}" onclick="window.open(this.href);return false;"|cond="$val['open_window']=='Y'">{$val['link']}<block cond="$menu_depth3['list']"><img src="img/{$layout_info->colorset}/arrow-down.png" alt="" class="arrow" /></block></a>
                           
                                <!--// main_menu 4차 시작 -->
                                <block cond="$menu_depth3['list']">
                                <ul>
                                    <block loop="$menu_depth3['list']=>$key,$val">
                                    {@ $menu_depth4 = $val }
                                    <block cond="$val['link']">
                                    <li class="on"|cond="$val['selected']"><a href="{$val['href']}" onclick="window.open(this.href);return false;"|cond="$val['open_window']=='Y'">{$val['link']}</a>
                                    </li>
                                    </block> <!--//end of if-->
                                    </block> <!--//end of loop-->
                                </ul>
                                </block>
                                <!--// main_menu 4차 끝 -->
                            </li>
                            </block><!--//end of if-->
                            </block><!--//end of loop-->
                        </ul>
                        </block>
                        <!--// main_menu 3차 끝 -->
                   
                    </li>
                    </block> <!--//end of cond-->
                    </block> <!--//end of loop-->
                </ul>
                </block>
                <!--// main_menu 2차 끝 -->
       
            </li>
            </block><!--// end of if -->
            </block><!--// end of loop -->
       
        </ul>
        <!--// main_menu 1차 끝 -->