How to Hide TaskBreaker - Group Project Management Admin Menus

function plt_hide_taskbreaker_project_management_menus() {
	//Hide the "Projects" menu.
	remove_menu_page('edit.php?post_type=project');
	//Hide the "Projects → All Projects" menu.
	remove_submenu_page('edit.php?post_type=project', 'edit.php?post_type=project');
	//Hide the "Projects → Add New Project" menu.
	remove_submenu_page('edit.php?post_type=project', 'post-new.php?post_type=project');
}

add_action('admin_menu', 'plt_hide_taskbreaker_project_management_menus', 15);

Where do I put this code?