Create a drop down sub menu in blogger (Blogspot)

1. Login Your Blogger Account

2. Go Dashboard>More option>Template

3. Take a backup:

Download a copy of your template:  this is a backup - save it somewhere safe, in case things go wrong.

5. Click Edit HTML and find out (Ctrl+F)

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6. Paste bellows code above it (5)

/*----- MBT Drop Down Menu ----*/
#mbtnavbar {
    background: #060505;
    width: auto;
    color: #FFF;
        margin: 0px;
        padding: 0;
        position: relative;
        border-top:0px solid #960100;
        height:35px;
}
#mbtnav {
    margin: 0;
    padding: 0;
}
#mbtnav ul {
    float: left;
    list-style: none;
    margin: 0;
    padding: 0;
}
#mbtnav li {
    list-style: none;
    margin: 0;
    padding: 0;
        border-left:1px solid #333;
        border-right:1px solid #333;
        height:35px;
}
#mbtnav li a, #mbtnav li a:link, #mbtnav li a:visited {
    color: #FFF;
    display: block;
   font:normal 12px Helvetica, sans-serif;
   margin: 0;
    padding: 9px 12px 10px 12px;
        text-decoration: none;

}
#mbtnav li a:hover, #mbtnav li a:active {
    background: #BF0100;
    color: #FFF;
    display: block;
    text-decoration: none;
        margin: 0;
    padding: 9px 12px 10px 12px;



}
#mbtnav li {
    float: left;
    padding: 0;
}
#mbtnav li ul {
    z-index: 9999;
    position: absolute;
    left: -999em;
    height: auto;
    width: 160px;
    margin: 0;
    padding: 0;
}
#mbtnav li ul a {
    width: 140px;
}
#mbtnav li ul ul {
    margin: -25px 0 0 161px;
}
#mbtnav li:hover ul ul, #mbtnav li:hover ul ul ul, #mbtnav li.sfhover ul ul, #mbtnav li.sfhover ul ul ul {
    left: -999em;
}
#mbtnav li:hover ul, #mbtnav li li:hover ul, #mbtnav li li li:hover ul, #mbtnav li.sfhover ul, #mbtnav li li.sfhover ul, #mbtnav li li li.sfhover ul {
    left: auto;
}
#mbtnav li:hover, #mbtnav li.sfhover {
    position: static;
}
#mbtnav li li a, #mbtnav li li a:link, #mbtnav li li a:visited {
    background: #BF0100;
    width: 120px;
    color: #FFF;
    display: block;
    font:normal 12px Helvetica, sans-serif;
    margin: 0;
    padding: 9px 12px 10px 12px;
        text-decoration: none;
z-index:9999;
border-bottom:1px dotted #333;

}
#mbtnav li li a:hover, #mbtnavli li a:active {
    background: #060505;
    color: #FFF;
    display: block;
    margin: 0;
    padding: 9px 12px 10px 12px;
        text-decoration: none;
}

Note: Highlights code you can change your won choice;

7. Save and then Go To Blogger >Layout

8. Take a HTML/JavaScript Gadget

9. Paste bellows code:

<div id='mbtnavbar'>
      <ul id='mbtnav'>
        <li>                                         
          <a href='#'>Home</a>
        </li>
        <li>
          <a href='#'>About</a>
       </li>
        <li>
          <a href='#'>Contact</a>
        </li>
  <li>
           <a href='#'>Sitemap</a>
            <ul>
                <li><a href='#'>Sub Page #1</a></li>                <li><a href='#'>Sub Page #2</a></li>                <li><a href='#'>Sub Page #3</a></li>              </ul>
        </li>
      </ul>
    </div>

Note: '#' changes it with your own url(s) and indicate menu name by your own title. Highlights url(s) is your sub or dropdown menu under Sitemap and you can use this highlights code under any menu item.

Enjoy it and create a dynamic blog as your own choice.