You could use an implementation of hook_menu(). Here's an example in code:
function services_menu() {
$items['services'] = array(
'title' => 'Services',
'description' => 'Description of services',
'access callback' => TRUE,
'page callback' => 'services_page_callback',
);
$items['services/development'] = array(
'title' => 'Drupal Development',
'access callback' => TRUE,
'type' => MENU_DEFAULT_LOCAL_TASK,
'weight' => -10,
);
$items['services/design'] = array(
'title' => 'Design',
'page callback' => 'design_tab_callback',
'access callback' => TRUE,
'type' => MENU_LOCAL_TASK,
'weight' => 0,
);
$items['services/seo'] = array(
'title' => 'SEO',
'page callback' => 'seo_tab_callback',
'access callback' => TRUE,
'type' => MENU_LOCAL_TASK,
'weight' => 10,
);
$items['services/hosting'] = array(
'title' => 'Hosting',
'page callback' => 'hosting_tab_callback',
'access callback' => TRUE,
'type' => MENU_LOCAL_TASK,
'weight' => 30,
);
$items['services/support'] = array(
'title' => 'Support',
'page callback' => 'support_tab_callback',
'access callback' => TRUE,
'type' => MENU_LOCAL_TASK,
'weight' => 40,
);
return $items;
}
for more info see the documentation for hook_menu().