how to add horizontal sub navigaion on blogger

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Login To Blogger Go To > Design > Edit HTML.

and mark the tick box "Expand Widget Templates"

Then, find (CTRL+F) this code in the template.

<div id='content-wrapper'>

And immediately after it, paste this code:

<ul id="topnav">
<li><a href="#">Link 1</a></li>
<li><a href="#">Link 2</a>
<!--Subnav Starts Here-->
<span>
<a href="#">Subnav Link</a> |
<a href="#">Subnav Link</a> |
<a href="#">Subnav Link</a>
</span>
<!--Subnav Ends Here--></li>
<li><a href="#">Link 3</a>
<!--Subnav Starts Here-->
<span>
<a href="#">Subnav Link</a> |
<a href="#">Subnav Link</a> |
<a href="#">Subnav Link</a>
</span>
<!--Subnav Ends Here--></li>
</ul>

Replace Names and # with your contents.

Now find this code in the template:

]]></b:skin>

And immediately before it, paste this code:

ul#topnav {
margin: 0; padding: 0;
float: left;
width: <span style="color: red;">970px</span>;
list-style: none;
position: relative; /*--Set relative positioning on the unordered list itself - not on the list item--*/
font-size: 1.2em;
background: #000000; repeat-x;
}
ul#topnav li {
float: left;
margin: 0; padding: 0;
border-right: 1px solid #555; /*--Divider for each parent level links--*/
}
ul#topnav li a {
padding: 10px 15px;
display: block;
color: #f0f0f0;
text-decoration: none;
}
ul#topnav li:hover { background: #1376c9 repeat-x; }
/*--Notice the hover color is on the list item itself, not on the link. This is so it can stay highlighted even when hovering over the subnav--*/

ul#topnav li span {
float: left;
padding: 15px 0;
position: absolute;
left: 0; top:35px;
display: none; /*--Hide by default--*/
width: <span style="color: red;">970px</span>;
background: #1376c9;
color: #fff;
/*--Bottom right rounded corner--*/
-moz-border-radius-bottomright: 5px;
-khtml-border-radius-bottomright: 5px;
-webkit-border-bottom-right-radius: 5px;
/*--Bottom left rounded corner--*/
-moz-border-radius-bottomleft: 5px;
-khtml-border-radius-bottomleft: 5px;
-webkit-border-bottom-left-radius: 5px;
}
ul#topnav li:hover span { display: block; } /*--Show subnav on hover--*/
ul#topnav li span a { display: inline; } /*--Since we declared a link style on the parent list link, we will correct it back to its original state--*/
ul#topnav li span a:hover {text-decoration: underline;}

Now click Save template.