title: Fork Github and then add in another repo
body: <p>I really hope this makes sense and someone can help as I'm pretty new to Github.</p>
  <p>I'd like to start work on a project that has been forked from a repo. The forked version is more UI based (it's now focus on one platform only) . The problem is that the original project has had a fork that updates the engine behind it. The UI is too far along to merge but I think I can hack out the old engine references and add the new forked engine.
  Am I able to fork the UI update and then somehow link to the fork of the original(forked) repo?</p>
  <p>i.e new repo:</p>
  <pre><code>./
   /original(forkedENGINE)/
   /original(forkedENGINE)/files
   /original(forkedUI)/
   /original(forkedUI)/files
   /new files
  </code></pre>
  <p>or is it work we just forking one and copying the engine or UI over?</p>