Tips on Customizing ViewNexa Bitcentral

How to Hide ViewNexa - Bitcentral Admin Menus

function plt_hide_fuel_bitcentral_menus() {
	//Hide "Settings → ViewNexa Settings".
	remove_submenu_page('options-general.php', 'fuel');

	//Hide "ViewNexa".
	remove_menu_page('edit.php?post_type=fuel');
	//Hide "ViewNexa → ViewNexa".
	remove_submenu_page('edit.php?post_type=fuel', 'edit.php?post_type=fuel');
	//Hide "ViewNexa → Add Post".
	remove_submenu_page('edit.php?post_type=fuel', 'post-new.php?post_type=fuel');
	//Hide "ViewNexa → ViewNexa Categories".
	remove_submenu_page('edit.php?post_type=fuel', 'edit-tags.php?taxonomy=fuel_category&post_type=fuel');
	//Hide "ViewNexa → ViewNexa Tags".
	remove_submenu_page('edit.php?post_type=fuel', 'edit-tags.php?taxonomy=fuel_tag&post_type=fuel');
	//Hide "ViewNexa → ViewNexa Script".
	remove_submenu_page('edit.php?post_type=fuel', 'fuel_script');

	//Hide "ViewNexa Importer".
	remove_menu_page('edit.php?post_type=fuel_importer');
	//Hide "ViewNexa Importer → ViewNexa Importer".
	remove_submenu_page('edit.php?post_type=fuel_importer', 'edit.php?post_type=fuel_importer');
	//Hide "ViewNexa Importer → Add Post".
	remove_submenu_page('edit.php?post_type=fuel_importer', 'post-new.php?post_type=fuel_importer');
}

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

Where do I put this code?

How to Hide ViewNexa - Bitcentral Meta Boxes

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

	//Hide the "ViewNexa Assets" meta box.
	remove_meta_box('fuel-assets-metabox', $screen->id, 'advanced');
	//Hide the "MRSS Data" meta box.
	remove_meta_box('fuel-mrss-importer-module', $screen->id, 'advanced');
}

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