I love using the custom formula feature! It would be great if right in the same interface there was an option to save the output as a global or maybe page scoped variable. For a simple example lets say I calculate the total manufacturing costs of an item I had made just by using transaction categories. It cost $10,000 total and I made 1000 things. I calculate the cost per item as $10. It would be great in more complex scenarios to now take the result of my calculation and use it elsewhere.