title: Insert a custom field value as a new row on email order totals table in Woocommerce
body: <p>I'm helping my mother create her website for her store i Denmark.
  It has gone okay, but now i'm stuck with a problem.
  I need to be able to make a custom field in the order complete email, that displays a track &amp; trace number, i've inserted on the admin order page. Everything i've done up until now, haven't worked, so therefore i seek your help. </p>
  
  <p>I've added a custom field already called <code>Track &amp; Trace Pakkenr.</code> (see screenshot 1)
  But the problem is getting this in the order complete email, under shipping (<code>forsendelse</code> in danish, see screenshot 2)</p>
  
  <p>I am also a complete and utter beginner in coding so if any of you can give any help or advice, please make it almost foolproof to follow.</p>
  
  <p>Here are the <a href="https://smagdansk.dk/wp-content/uploads/2018/08/Sk%C3%A6rmbillede-2018-08-16-kl.-14.56.16.jpg" rel="nofollow noreferrer">screenshot 1</a> and <a href="https://smagdansk.dk/wp-content/uploads/2018/08/Sk%C3%A6rmbillede-2018-08-16-kl.-14.57.00.jpg" rel="nofollow noreferrer">screenshot 2</a>.</p>