Create custom add_menu_page and add_submenu_page in admin panel

function theme_options_panel(){
  add_menu_page('Theme page title', 'Theme menu label', 'manage_options', 'theme-options', 'wps_theme_func');
  add_submenu_page( 'theme-options', 'Settings page title', 'Settings menu label', 'manage_options', 'theme-op-settings', 'wps_theme_func_settings');
  add_submenu_page( 'theme-options', 'FAQ page title', 'FAQ menu label', 'manage_options', 'theme-op-faq', 'wps_theme_func_faq');
}
add_action('admin_menu', 'theme_options_panel');

function wps_theme_func(){
                
}
function wps_theme_func_settings(){
                
}
function wps_theme_func_faq(){
                
}