add_menu_page() with different name for first submenu item

add_menu_page() with different name for first submenu item

When adding more pages later via add_submenu_page, the main page becomes the first entry in the submenu:

 
<?php 

add_action('admin_menu', 'event_setup_menu');

function event_setup_menu() {
    add_menu_page('Waiting List Page', 'Show Event Entries', 'manage_options', 'eventregistration-plugin', 'eventregistration_init');
    add_submenu_page('eventregistration-plugin', 'Waiting List Request', 'Waiting List Request', 'manage_options', 'waiting_list_request', 'waiting_list_request');
    add_submenu_page('eventregistration-plugin', 'Additional Attendees', 'Additional Attendees', 'manage_options', 'additional_attendees_list', 'additional_attendees_list');
    unset($GLOBALS['submenu']['eventregistration-plugin'][0]);
}

function additional_attendees_list() {
 
}

function waiting_list_request() {
 
}
?>

 
//make the slug of parent menu item and sub menu same (first one item) like below
<?php 

function acutions_recent_bids_add_admin_page(){

add_menu_page('Recent Bids', 'Auction Reports', 'manage_options','wc-auction-reports','acutions_recent_bids_list','dashicons-chart-area', 56);   

add_submenu_page(
    'wc-auction-reports',       // parent slug
    'Recent Bids',    // page title
    'Recent Bids',             // menu title
    'manage_options',           // capability
    'wc-auction-reports', // slug
    'acutions_customers_spendings_list' // callback
); 


add_submenu_page(
    'wc-auction-reports',       // parent slug
    'Customer Spending',    // page title
    'Customer Spending',             // menu title
    'manage_options',           // capability
    'wc-acutions-customers-spendings', // slug
    'acutions_customers_spendings_list' // callback
); 

add_submenu_page(
    'wc-auction-reports',       // parent slug
    'Customer Bids',    // page title
    'Customer Bids',             // menu title
    'manage_options',           // capability
    'wc-acutions-customers-bids', // slug
    'acutions_customers_bids_list' // callback
);  

}

add_action('admin_menu','acutions_recent_bids_add_admin_page'); 
?>