Adding a menu section through template function

Ok,

Currently I have a function which adds a submenu to the Appearance admin section called Opening Times.

What I’d really like to have though is another section like Appearance but called Theme Settings, then I can add Opening Times, Description etc to it and create a whole sub section for that particular template. I’ve looked at the codex but I can’t get my head around it as it’s more geared towards plugins – can anyone help add to the code to try and accomplish this task?

<?php class ControlPanel {

var $default_settings = Array(
  'day1' => 'Monday',
  'time1' => '9:30-6:30'
  );

  function ControlPanel() {
    add_action('admin_menu', array(&$this, 'admin_menu'));
    add_action('admin_head', array(&$this, 'admin_head'));

    if (!is_array(get_option('parkway')))
    add_option('parkway', $this->default_settings);
    $this->options = get_option('parkway');

    if (function_exists('register_sidebar'))
        register_sidebar(array('name' => 'Sidebar'));
  }

  function admin_menu() {
    add_theme_page('Parkway Options', 'Opening Times', 'edit_themes', "parkway", array(&$this, 'optionsmenu'));
  }

  function admin_head() {
    echo '<link rel="stylesheet" href="'.get_bloginfo('template_url').'/code/controlpanel.css" type="text/css" media="screen" />';
  }

  function optionsmenu() {
  echo '<div id="icon-tools" class="icon32"><br /></div>';
  echo '<div class="wrap">';
  echo '<h2>Parkway Options</h2><br />';
  echo '<h3>Opening Times</h3><hr color="lightgray" width="99%" align="left" size="1">';
  if ($_POST['ss_action'] == 'save') {
    $this->options["day1"] = $_POST['cp_day1'];
	$this->options["time1"] = $_POST['cp_time1'];
    update_option('parkway', $this->options);
    echo '<div class="updated fade" id="message" style="background-color: rgb(255, 251, 204); width: 300px; margin-left: 20px"><p>Settings <strong>saved</strong>.</p></div>';
  }

  echo '<form action="" method="post" class="themeform">';
  echo '<input type="hidden" id="ss_action" name="ss_action" value="save">';
  echo '<p>Day of the Week: <input class="widefat" style="text-align: right; width: 75px" name="cp_day1" id="cp_day1" type="text" value="'.$this->options["day1"].'" /></p>';
  echo '<p>Time: <input class="widefat" style="text-align: right; width: 75px" name="cp_time1" id="time1" type="text" value="'.$this->options["time1"].'" /></p>';
  echo '<p class="submit"><input type="submit" value="Save Changes" name="cp_save"/></p>';
  echo '</form>';
  echo '</div>';
}
}

Thanks a lot for your time.
Steve