VBA Line Numbers with CodeLiner - Version 2.0 VBA Line Numbers with CodeLiner is an Excel toolbar that allows you to add and remove line numbers in your VBA Project. Line numbers are important for discovering the exact location of an error when using the built-in Erl () function. When you need an unobstructed view of your code, use this toolbar to clean-up the line numbers. When ready to debug errors or deploy to production, use the toolbar again to toggle on the code line numbers.