title: how to combine two variables data into two rows in SAS
body: <p>We have three variables in sas dataset  and we want to create a new variable which would have values transposed for 2 variables and the third remain as it is.</p>
  <p>Eg:</p>
  <pre><code>Acct_nb repl_acct_nb amount
  12334       45678     100
  23456       .         200
  </code></pre>
  <p>Output needed:</p>
  <pre><code> new_acct_nb amount
   12334       100
   45678       100
   23456       200
  </code></pre>