title: change column letter in formula with drag down
body: <p>This is the formula
  =SUM(Sheet2!A2:A10)</p>
  
  <p>What i've been trying to do is as I drag down the column to have the formula change to =SUM(Sheet2!B2:B10) and so on.</p>
  
  <p>Basically is what happens we drag to the right we get an increment on the column letter, but I want it when I drag down</p>