Tips on Customizing 1003 Mortgage Application

How to Hide 1003 Mortgage Application Admin Menus

function plt_hide_1003_mortgage_application_menus() {
	//Hide "Applications".
	remove_menu_page('edit.php?post_type=mortgage_application');
	//Hide "Applications → Applications".
	remove_submenu_page('edit.php?post_type=mortgage_application', 'edit.php?post_type=mortgage_application');
	//Hide "Applications → Bulk Export".
	remove_submenu_page('edit.php?post_type=mortgage_application', 'ma_export');
	//Hide "Applications → Settings".
	remove_submenu_page('edit.php?post_type=mortgage_application', 'ma_setting');
}

add_action('admin_menu', 'plt_hide_1003_mortgage_application_menus', 11);

Where do I put this code?

How to Hide 1003 Mortgage Application Meta Boxes

function plt_hide_1003_mortgage_application_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Application Data" meta box.
	remove_meta_box('type_of_loan', $screen->id, 'advanced');
	//Hide the "Mortgage Application Action" meta box.
	remove_meta_box('mortgage_application_action', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_1003_mortgage_application_metaboxes', 20);