How to Hide UpStream Admin Menus

function plt_hide_upstream_menus() {
	//Hide "Projects".
	remove_menu_page('edit.php?post_type=project');
	//Hide "Projects → Projects".
	remove_submenu_page('edit.php?post_type=project', 'edit.php?post_type=project');
	//Hide "Projects → Milestones".
	remove_submenu_page('edit.php?post_type=project', 'edit.php?post_type=upst_milestone');
	//Hide "Projects → Milestone Categories".
	remove_submenu_page('edit.php?post_type=project', 'edit-tags.php?taxonomy=upst_milestone_category&post_type=upst_milestone');
	//Hide "Projects → Tasks".
	remove_submenu_page('edit.php?post_type=project', 'tasks');
	//Hide "Projects → Bugs".
	remove_submenu_page('edit.php?post_type=project', 'bugs');
	//Hide "Projects → Clients".
	remove_submenu_page('edit.php?post_type=project', 'edit.php?post_type=client');
	//Hide "Projects → Categories".
	remove_submenu_page('edit.php?post_type=project', 'edit-tags.php?taxonomy=project_category&post_type=project');
	//Hide "Projects → Tags".
	remove_submenu_page('edit.php?post_type=project', 'edit-tags.php?taxonomy=upstream_tag&post_type=project');

	//Hide "UpStream".
	remove_menu_page('upstream_general');
	//Hide "UpStream → General".
	remove_submenu_page('upstream_general', 'upstream_general');
	//Hide "UpStream → Projects".
	remove_submenu_page('upstream_general', 'upstream_projects');
	//Hide "UpStream → Tasks".
	remove_submenu_page('upstream_general', 'upstream_tasks');
	//Hide "UpStream → Bugs".
	remove_submenu_page('upstream_general', 'upstream_bugs');
	//Hide "UpStream → Extensions".
	remove_submenu_page('upstream_general', 'upstream_extensions');
}

add_action('admin_menu', 'plt_hide_upstream_menus', 11);
Where do I put this code?