Adding subtitle below post title

In some cases, some posts requires a second title right below main title.

To implement a subtitle function for your site Open single.php and paste this

<?php 
$subtitle = get_post_meta($post->ID, 'subtitle', true);
if ($subtitle !== '') {
	echo '<p class="subtitle">' . $subtitle . '</p>';
} ?>

right after

<h1 class="entry_title">
	<?php the_title(); ?>
</h1>

And paste this into custom.css box of theme options page

.entry .subtitle {
	color:#333;
	font:italic 25px/25px Georgia,Times,serif;
	margin-bottom:25px;
}

Now, you can use custom fields to display a second title on single post pages. Custom field name subtitle and include any text you want to display on single post page into the value field.