Hi:
Basically Sidebar Widgets are inserted through the following method that can be found in the theme’s template files.
dynamic_sidebar( 'secondary-widget-area' );
Where the value passed is the name of the sidebar.
To be able to use the WordPress Widget Admin to drag-n-drop widgets to your named sidebars you will need to register them in your theme’s functions.php file.
Example:
register_sidebar(
array(
'name' => __( 'Secondary Widget Area', 'twentyten' ),
'id' => 'secondary-widget-area',
'description' => __( 'The secondary widget area', 'twentyten'
),
'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
'after_widget' => '</li>',
'before_title' => '<h3 class="widget-title">',
'after_title' => '</h3>',
) );
You should be able to search the functions file and copy the existing registration and change the name to your newly created one and you should be all set.
Hope this helps you out.