How to Hide MockUp Admin Menus

function plt_hide_mockup_menus() {
	//Hide "MockUp".
	remove_menu_page('edit.php?post_type=pt_mockup_plugin');
	//Hide "MockUp → All MockUps".
	remove_submenu_page('edit.php?post_type=pt_mockup_plugin', 'edit.php?post_type=pt_mockup_plugin');
	//Hide "MockUp → Add new MockUp".
	remove_submenu_page('edit.php?post_type=pt_mockup_plugin', 'post-new.php?post_type=pt_mockup_plugin');
	//Hide "MockUp → Customers".
	remove_submenu_page('edit.php?post_type=pt_mockup_plugin', 'edit-tags.php?taxonomy=relate_mockup&post_type=pt_mockup_plugin');
	//Hide "MockUp → Settings".
	remove_submenu_page('edit.php?post_type=pt_mockup_plugin', 'mockup_options');
}

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

Where do I put this code?