title: Azure DevOPs Pipeline Variable using a variable syntax
body: <p>Straightforward. if you know the Syntax I have googled to no avail, so it may not be possible.</p>
  
  <p>To avoid multiple variable updates, in Octopus I used nested variables I am converting to Azure DevOps Pipeline but cannot find the syntax </p>
  
  <p>Octopus Variables used:-</p>
  
  <pre><code>e.g variable 1 - my.VirtualDirectory, Value - Website2018 
      variable 2 - TargetDatabasename, Value - #{my.VirtualDirectory}_DB_Checking
      variable 3 - TargetDatabasename, Value - #{my.VirtualDirectory}_DB_Checked
  </code></pre>
  
  <p>the #{} allowed a nested variable, can anyone help with the syntax for Azure DevOps Pipeline?</p>