title: How delete the config in Build Settings in a low level in XCode 4
body: <p>In XCode 4.0.2 there is a good way to configure the program in <code>Build Settings</code> when you click in "Levels" format. Like this screen</p>
  
  <p><img src="https://i.stack.imgur.com/6qEoK.png" alt="showing a sample in Vuild Settings"></p>
  
  <p>The levels are in this way:</p>
  
  <ol>
  <li>Target Settings</li>
  <li>Project Settings</li>
  <li>iOS Default Settings</li>
  </ol>
  
  <p>So the XCode see if the <code>Target</code> have a config, if not see in <code>project</code> and if not use the <code>iOS default</code>.</p>
  
  <p>The problem here is that when you set a config in a low level and than delete it, it's impossible use the config of a upper level. </p>
  
  <p>Like in image. I set all targets to use <code>Google</code> in <code>Current Project Version</code>, but in this target I want it use <code>stackOverflow</code> and it work. But in the other <code>Generated Versioning ...</code> I first config with <code>stackOverflow</code> but change my mind and want to use the <code>Project Settings</code>. Now is impossible delete the <code>Target Settings</code> and I will have to enter it manually. </p>
  
  <p>How can I delete the target setting to use the project setting?</p>