Business Modeling with Excel.

Think of a feature in Excel that has caused you to say to yourself, "Hey, that's so cool!" Then, write out a thorough, step-by-step explanation of how that feature works, so that anyone reading, even someone brand new to Excel, could make it work. Feel free to add visuals like icons or screen grabs, bullet or number your steps if you like, or even record yourself performing the task. Just don't link to someone else's explanation, like we did in Help Links. This is your opportunity to teach us.