title: Drop-down validation list created dynamically
body: <p>In range A1 I have a drop-down validation list. Based on the user's selection from that list I would like to dynamically create a new drop-down validation list in range C1.
  For instance, in A1 the list contains:</p>
  
  <p>A</p>
  
  <p>B</p>
  
  <p>C</p>
  
  <p>So if the user selects A from the list, the new list in C1 contains:</p>
  
  <p>1) Annoying Orange</p>
  
  <p>2) Angry Birds</p>
  
  <p>3) Arbitrary Sample</p>
  
  <p>If the user selects B, the new list contains:</p>
  
  <p>1) Bloated Code</p>
  
  <p>2) Better Left Unsaid</p>
  
  <p>3) Bad Attempt</p>
  
  <p>etc</p>
  
  <p>Easy enough to do using VBA. But in GAS.... I have absolutely <em>no idea</em> of how to even start :/</p>