Admin Menus – Name Menu different from first Submenu [duplicate]

The first menu item typically is the parent item and shares the name with that item, you can however manually update the entry directly in the $submenu variable, like so..

add_action( 'admin_menu', 'jp_create_admin_pages' );

function jp_create_admin_pages() {
    global $submenu;
    add_menu_page('Members','Members','manage_options','members','jp_handle_admin_members');
    add_submenu_page('members','Membership Types','Membership Types','manage_options','membership_types','jp_handle_admin_membership_types');
    $submenu['members'][0][0] = 'All Members';
}

That way your parent keeps the original name, whilst the first subitem has another.

Hope that helps.