Always wondered how to leave a reply to specific comments or a thread like replies. Well wordpress made it very simple for you. The function wp_list_comments accepts various useful parameters . There is one parameter called max_depth which is going to do the trick for you. If you open your themes folder (wp-content/themes/your_active_theme_folder) then you will see comments.php . Open that file in the built-in theme-editor of wordpress or if you are using FTP then open it any text-editor.
Carefully examine the file and look around for wp_list_comments function. Look for the params which are already passed. If there are no parameters, then pass them like this.
<?php $args=array("max_depth"=>"22"); ?> <ol> <?php wp_list_comments($args); ?> </ol>
If the above method doesn’t work, please let me know..