Excel LAMBDA Lesson 8: Package and Share Your Function Library

📎 This article includes 1 downloadable practice file ↓

📘 Excel LAMBDA Library Course · Lesson 8 of 8

Thirty functions are only useful if your team can get them. Here’s how to package them.

1. One library workbook

Create AJ-Functions.xlsx with all names defined and a Help sheet listing each function, its arguments and an example. Keep it on OneDrive or SharePoint.

2. Copy functions into another workbook

• Easiest: copy any sheet that uses the functions into the target workbook (right-click tab > Move or Copy > tick Create a copy). The names come along. Delete the sheet afterwards; the names stay.
• Advanced Formula Environment (free Microsoft add-in from Excel Labs): edit all your LAMBDAs as text in one editor, with comments, and import a whole library from a GitHub gist URL.

3. Make a template

Save a blank workbook with the library as Book.xltx in the XLSTART folder and every new workbook starts with your functions.

4. Version it

Add a LIBVERSION =LAMBDA("2026.10") name. When something looks wrong in a colleague’s file, =LIBVERSION() tells you which version they have.

What you’ve built

Money (GSTINCL, GSTEXCL, LAKHS, CRORE), text (CLEANNAME, DIGITSONLY, MASK), dates (FYLABEL, FYQTR, DAYSLEFT), list tools (MULTIREPLACE, running balances) and safe helpers (SAFEDIV). Put them to work on real data in the Bank Statement Automation course.

Practice

Download the workbook below. Each task combines functions from earlier lessons. The tasks call each function inline, like =LAMBDA(x,x*2)(A2), so the file works on any Microsoft 365 PC; in your own files, save them by name in Name Manager. The Check column turns green when you’re right.