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Tips on Customizing Opal Portfolio

How to Hide Opal Portfolios Admin Menus

function plt_hide_opal_portfolios_menus() {
	//Hide "Opal Portfolio".
	remove_menu_page('edit.php?post_type=opal_portfolio');
	//Hide "Opal Portfolio → Opal Portfolio".
	remove_submenu_page('edit.php?post_type=opal_portfolio', 'edit.php?post_type=opal_portfolio');
	//Hide "Opal Portfolio → Add New Portfolio".
	remove_submenu_page('edit.php?post_type=opal_portfolio', 'post-new.php?post_type=opal_portfolio');
	//Hide "Opal Portfolio → Portfolio Categories".
	remove_submenu_page('edit.php?post_type=opal_portfolio', 'edit-tags.php?taxonomy=portfolio_cat&post_type=opal_portfolio');
	//Hide "Opal Portfolio → Settings".
	remove_submenu_page('edit.php?post_type=opal_portfolio', 'portfolio-settings');
}

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

Where do I put this code?

How to Hide the "Management" Meta Box

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

	//Hide the "Management" meta box.
	remove_meta_box('opal_portfolio_managements', $screen->id, 'normal');
}

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