title: Linked metabox options
body: <p>Is it possible to construct a metabox, that has several options that are linked?</p>
  
  <p>Say I have 3 selections to choose from, with several options:</p>
  
  <p>Selection 1: A1, A2, A3, A4</p>
  
  <p>Selection 2: B1, B2, B3, B4, B5</p>
  
  <p>Selection 3: C1, C2, C3</p>
  
  <p>Now, when I select A1 option, the only available options from two other selections are for instance B2, B4, B5 and C1. And so on, for various options.</p>
  
  <p>The thing is that I can easily create those options, and then just put in a description saying what option can go with what other options. Say you selected A1 and B1, but B1 won't work, so you shouldn't select it, I can just write that down, but I think that's not so user friendly, and people are sometimes lazy to read, so it's just easier to limit out those options.</p>
  
  <p>Can it be done? And how? HTML manipulating or within PHP with <code>switch</code> or <code>if-else-if</code> statements?</p>