title: How can I add or subtract using case formulas?
body: <p>I have sales metrics tracking using case formulas to give me a sum when a status is updated in system notes. If you look at the image, what I'm trying to accomplish is to add a column that would show total appointments (first formula) minus the set number of '20'.  I want to see the difference between the sum and the sales target of 20</p>
  <p><img src="https://i.stack.imgur.com/oodA8.png" alt="Case formulas image" /></p>