Build flexible Excel functions that automatically handle blanks, defaults, and overrides without messy nested IFs.

Switch from manual entries to automated generators that keep your spreadsheets clean, consistent, and error-free.

Excel validation lists avoid blanks and errors with TOCOL(ignore) plus FILTER; the spill range stays stable across worksheets.

Daniel Jassy, CFA, is an Investopedia Academy instructor and the founder of SPYderCRusher Research. He contributes to Excel and Algorithmic Trading. David Kindness is a Certified Public Accountant ...