title: Select range based on 3 relative references
body: <p>I have a very large file, where I need to select the range delimited by just 3 points in order to export it;
  My references are 2 column headers that are defined, and the last cell situated before the first blank in another column.
  The 2 column headers, "W" and "Z", are always in row 5, but "W" can be in cell Ax and W in cell Ay, no fixed distance between Ax and Ay.</p>
  
  <p>Your help is much appreciated!</p>
  
  <p>Edit - triying to add more detail as I can´t add pictures:</p>
  
  <p>Let´s say I´ve 2 columns I care about first: </p>
  
  <p>The first one to the left, is the one that contains the header "W", and the other, is the one that contains the header "Z". </p>
  
  <p>I don´t know if there are 20 or 234 columns in the middle, if that´s the case, I would need to select all of them, as they´re betweeen my limits.</p>
  
  <p>If there´s more information beyond column labeled "Z", that I don´t care.
  So with this, I´ve my weidht.</p>
  
  <p>Now, for the height, I need to check column "YY", which is always between "W" and "Z", and go down to the last consecutive value it has - let´s call it "E" (that means that if we´ve a blank cell in that column, I don´t care anymore about the other values below).</p>
  
  <p>So, my height will go from the row that contains the label, to the one that contains value "E".</p>