<?php $categories=get_categories('order=DESC&hide_empty=0&hierarchical=0'); ?>
<?php $parent = get_cat_name($category[0]->category_parent); ?>

<?php foreach($categories as $category) {

        if(!empty($parent)) :

                echo "<p>".$category->name."</p>";

            else :

                echo "<p>".$category->name."</p>";

                /* Loop Show Post Titles */

            endif;


} /* End of Foreach*/  ?>


What I to do is something like this

Category 1
    Child Category 1.1
        Sub-Child Category 1.1.1
            Post Title 1
            Post Title 2
            Post Title 3
    Child Category 1.2
        Sub-Child Category 1.1.1
            Post Title 4
            Post Title 5
            Post Title 6
Category 2
    Child Category 2.1
    Child Category 2.2
    Child Category 2.3....
Category 3
    Child Category 3.1.....