title: is_vat_exempt(); on order for different user
body: <p>Okay the title may not be that clear but I have an issue that seems poorly documented. I'm using a telesales/manual order system and need to work out a vat exempt system for users from another country. </p>
  
  <p>I found the following after a very long search:</p>
  
  <pre><code>is_vat_exempt(); 
  </code></pre>
  
  <p>From what I read this saves in the session of the customer. Which is great. People are able to order without VAT themselves. However. In our telesales system you're often logged in as a admin related role. You fill in the details from the customer or select their account. During this process the so called customer is still the account that is logged in; the seller. </p>
  
  <p>The code works something like this:</p>
  
  <pre><code>woocommmerce-&gt;customer-&gt;is_vat_exempt();
  </code></pre>
  
  <p>To set someone as vat exempt you can use the following:</p>
  
  <pre><code>set_is_vat_exempt( $is_vat_exempt );
  </code></pre>
  
  <p>Right now I am simply stuck. Would I be able to make the order vat exempt for the user that is filled in the form? Without changing the session to one for the customer? </p>