title: Combining columns in a SAS dataset
body: <p>My question involves combining multiple columns in a dataset into a single column.  I know that this question has been answered several times before, but that was only for a single variable outside of a larger dataset.  This is for two variables in a larger data set.  </p>
  
  <p>Basically, here is what the data looks like:</p>
  
  <pre><code>Range Pass Height Height_1 Height_2 Height_3  V   V_1   V_2   V_3   Breed Treatment
  2     6    200    .        .        .         20  .     .     .     AAAA  1
  2     8    .      179      .        .         .   18    .     .     BBBB  1
  2     10   .      .        199      .         .   .     21    .     CCCC  1
  2     12   .      .        .        188       .   .     .     19    DDDD  1
  3     6    155    .        .        .         17  .     .     .     BBBB  2
  3     8    .      201      .        .         .   22    .     .     AAAA  2
  3     10   .      .        195      .         .   .     20    .     CCCC  2
  3     12   .      .        .        188       .   .     .     18    DDDD  2
  </code></pre>
  
  <p>So basically, I want to combine all four "Height" columns into a single Height column and all four "V" columns into a single V column while keeping all the other columns unchanged.</p>