title: Is there a way to apply tags to cells in Excel, and calculate with those tags?
body: <p>I've never seen anything like this, but I thought of it and now I can't imagine why it's never been implemented before.</p>
  
  <p>Think about CSS. You can apply "tags" of sorts (classes) to any element in HTML, and them with CSS, apply styling to any and all objects that might be of that class. You don't have to explicitly name them, the rendering engine just knows that everything with that class gets that style.</p>
  
  <p>Now put that in excel. So basically you apply an attribute to a few cells, and then in an equation, do something like:
  =SUM([ATTRIBUTE])</p>
  
  <p>It's crazy how useful this would be.</p>
  
  <p>So is this something that already exists in Excel, or no?
  And if it's not already in excel, what could I possibly do to get the idea in the developer's heads?</p>