title: Adding configuration to Test plan in VSTS
body: <p>I am facing issue with preserving the outcome from my last test execution.
  e.g. </p>
  
  <ol>
  <li>I have a Test Plan 'Relase2.0' and the assigned configuration is 'Win 10'</li>
  <li>Now I run this test plan and I could see how many have passed, failed, blocked, not run.</li>
  <li>Now I go and create a new configuration and assign this Test plan to the newly added configuration.</li>
  <li>Now I switch back to my previous configuration from step 1</li>
  <li>When I check the outcome from the step 2 execution, I see that I have lost those and I see all those in Not Run status.</li>
  </ol>
  
  <p>Question: How do I preserve the execution from step 2.?</p>