Add post-new.php?post_cat=catslug to admin menu

To see the the current array keys try this:

add_action( 'admin_menu' , 'admin_menu_new_items', 1 );
function admin_menu_new_items() {
    global $submenu;
    wp_die( '<pre>' . var_export( $submenu['edit.php'], true ) . '</pre>' );
}

I get this:

array (
  5 => 
  array (
    0 => 'All Posts',
    1 => 'edit_posts',
    2 => 'edit.php',
  ),
  10 => 
  array (
    0 => 'Add New',
    1 => 'edit_posts',
    2 => 'post-new.php',
  ),
  15 => 
  array (
    0 => 'Categories',
    1 => 'manage_categories',
    2 => 'edit-tags.php?taxonomy=category',
  ),
  16 => 
  array (
    0 => 'Tags',
    1 => 'manage_categories',
    2 => 'edit-tags.php?taxonomy=post_tag',
  ),
)

Index ’10’ is the Add New item. To add the new sub menu items use indexes 11, 12 and 13:

    $submenu['edit.php'][11] = array( 'Add New Profile', 'manage_options' , '/wp-admin/post-new.php?post_cat=pitches' );
    $submenu['edit.php'][12] = array( 'Add New News', 'manage_options' , '/wp-admin/post-new.php?post_cat=news' );
    $submenu['edit.php'][13] = array( 'Add New Pitch', 'manage_options' , '/wp-admin/post-new.php?post_cat=pitch' );

When WordPress adds the sub menu items to the dashboard it treats$submenuas an associative array. Any items added to theedit.phparray will be added to the end of array regardless of the key used. Use ksort() to order the keys.

    ksort( $submenu['edit.php'], SORT_NUMERIC );

Putting it all together:

add_action( 'admin_menu' , 'admin_menu_new_items', 1 );
function admin_menu_new_items() {
    global $submenu;

    $submenu['edit.php'][11] = array( 'Add New Profile', 'manage_options' , '/wp-admin/post-new.php?post_cat=pitches' );
    $submenu['edit.php'][12] = array( 'Add New News', 'manage_options' , '/wp-admin/post-new.php?post_cat=news' );
    $submenu['edit.php'][13] = array( 'Add New Pitch', 'manage_options' , '/wp-admin/post-new.php?post_cat=pitch' );

    // WordPress treats $submenu as an associative array and does not sort it first.
    // We have to sort keys into the order we want them to show up.
    ksort( $submenu['edit.php'], SORT_NUMERIC );
}