Tips on Customizing TemplatesNext ToolKit

How to Hide TemplatesNext ToolKit Admin Menus

function plt_hide_templatesnext_toolkit_menus() {
	//Hide "Testimonials".
	remove_menu_page('edit.php?post_type=testimonials');
	//Hide "Testimonials → Testimonials".
	remove_submenu_page('edit.php?post_type=testimonials', 'edit.php?post_type=testimonials');
	//Hide "Testimonials → Add New Testimonial".
	remove_submenu_page('edit.php?post_type=testimonials', 'post-new.php?post_type=testimonials');
	//Hide "Testimonials → Testimonial Categories".
	remove_submenu_page('edit.php?post_type=testimonials', 'edit-tags.php?taxonomy=testimonials-category&post_type=testimonials');

	//Hide "Portfolio".
	remove_menu_page('edit.php?post_type=portfolio');
	//Hide "Portfolio → Portfolio".
	remove_submenu_page('edit.php?post_type=portfolio', 'edit.php?post_type=portfolio');
	//Hide "Portfolio → Add New Portfolio Item".
	remove_submenu_page('edit.php?post_type=portfolio', 'post-new.php?post_type=portfolio');
	//Hide "Portfolio → Portfolio Categories".
	remove_submenu_page('edit.php?post_type=portfolio', 'edit-tags.php?taxonomy=portfolio-category&post_type=portfolio');

	//Hide "itrans Slider".
	remove_menu_page('edit.php?post_type=itrans-slider');
	//Hide "itrans Slider → itrans Slider".
	remove_submenu_page('edit.php?post_type=itrans-slider', 'edit.php?post_type=itrans-slider');
	//Hide "itrans Slider → Add New itrans Slide".
	remove_submenu_page('edit.php?post_type=itrans-slider', 'post-new.php?post_type=itrans-slider');
	//Hide "itrans Slider → itrans Slider Categories".
	remove_submenu_page('edit.php?post_type=itrans-slider', 'edit-tags.php?taxonomy=itrans-slider-category&post_type=itrans-slider');

	//Hide "Team".
	remove_menu_page('edit.php?post_type=team');
	//Hide "Team → Team".
	remove_submenu_page('edit.php?post_type=team', 'edit.php?post_type=team');
	//Hide "Team → Add New Team Member".
	remove_submenu_page('edit.php?post_type=team', 'post-new.php?post_type=team');
	//Hide "Team → Team Categories".
	remove_submenu_page('edit.php?post_type=team', 'edit-tags.php?taxonomy=team-category&post_type=team');
}

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

Where do I put this code?

How to Hide TemplatesNext ToolKit Meta Boxes

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

	//Hide the "2nd Feature Image" meta box.
	remove_meta_box('portfolio-feature-image-2', $screen->id, 'side');
	//Hide the "3rd Feature Image" meta box.
	remove_meta_box('portfolio-feature-image-3', $screen->id, 'side');
	//Hide the "itrans Slide Meta" meta box.
	remove_meta_box('itrans-slider', $screen->id, 'normal');
	//Hide the "Team Member Details" meta box.
	remove_meta_box('teammember', $screen->id, 'normal');
	//Hide the "Testimonial Meta" meta box.
	remove_meta_box('testimonialmeta', $screen->id, 'normal');
}

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