Tips on Customizing Price Table

How to Hide Pricetable WP Admin Menus

function plt_hide_pricetable_wp_menus() {
	//Hide "Price Tables".
	remove_menu_page('edit.php?post_type=pricetable-wp');
	//Hide "Price Tables → All Price Tables".
	remove_submenu_page('edit.php?post_type=pricetable-wp', 'edit.php?post_type=pricetable-wp');
	//Hide "Price Tables → Add New Price Table".
	remove_submenu_page('edit.php?post_type=pricetable-wp', 'post-new.php?post_type=pricetable-wp');
	//Hide "Price Tables → Welcome".
	remove_submenu_page('edit.php?post_type=pricetable-wp', 'pricetable-wp-welcome');
}

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

Where do I put this code?

How to Hide Pricetable WP Meta Boxes

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

	//Hide the "Price Table Design Template" meta box.
	remove_meta_box('pricetable-wp', $screen->id, 'normal');
	//Hide the "Price Table Shortcode" meta box.
	remove_meta_box('pricetable-wp-shortcode', $screen->id, 'side');
	//Hide the "Price Table Sidebar Settings" meta box.
	remove_meta_box('pricetable-wp-sidebar', $screen->id, 'side');
}

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