title: Subtracting Dynamic columns
body: <p>I have a data base where I have a new week's data coming in each week. I want to be able to take the values in that field and subtract them with an older week's field to get somewhat of a slope. I need to make this as automated as possible:</p>
  
  <p>Currently have</p>
  
  <p>Recent Decrease: [Week 13] - [Week 9]</p>
  
  <p>I have to go in and change the weeks manually every week, so any suggestions on how to make this less manual?</p>
  
  <p>Thanks</p>