title: Merging web.configs between projects
body: <p>I have a common web project which is used as a base for several "child" web projects. Is it possible to apply a web.config transform/merge between projects? Let's say the structure looks like this:</p>
  
  <pre><code>base project
    - web.config
  
  child project
    - web.config
      - transform.config
  </code></pre>
  
  <p>Is it possible to make a pre build event or similar that merges the base project web.config with the child project web.config?</p>