Performance becomes an issue with large datasets too. A poorly written macro can bog down Excel and take forever to complete, ...

Merge Sheets to a new or existing file Before merging, ensure you have all the Excel files open. Only when they are open can the Excel merge function choose a destination.

How to Move Macros to a Different Computer With Excel. Excel macros allow you to automate all sorts of tasks, from entering commonly used data to automatic printing and saving of files.