title: How to apply config transformations to an external config file
body: <p>I can't find an example of my question on the web and was wondering if anybody knew a solution.  Basically, if on our web.config we point to another file, like so:</p>
  
  <pre><code>&lt;configuration&gt;
    &lt;configSections /&gt;
    &lt;appSettings file="AppSettings.config"&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>then how do we apply transformations to that external file?</p>
  
  <p>Basically, I want to create an AppSettings.config, AppSettings.Debug.config, AppSettings.Release.config and have a transformation run over it...  Is this even possible?</p>
  
  <p>Thanks in advance,</p>
  
  <p>Sergio</p>