title: Grouping non-consecutive items in Excel 2013
body: <p>I'm trying to see if I can do a collapse (+/-) thing on Excel by grouping items together. However, I want to group items that are non-consecutive. Here's an example:</p>
  
  <pre><code>1: a
  2: b
  3: ac
  4: be
  5: ay
  6: bi
  7: ace
  8: bye
  </code></pre>
  
  <p>I would want to group it by putting all of the items that start with "a" under "a" and the same with "b." Basically, I'd be grouping lines 3, 5, 7 under line 1 and the rest of the lines, except for line 2, under line 2. So, how do I go about this?</p>
  
  <p>I've tried using the group option, but it won't let me group nonconsecutive rows together.</p>