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Hello @Eric Fitzgerald
To answer your question directly: there is no official list of "available" versus "unavailable" letters. In general, you can assign a single letter (A-Z), and Excel will combine it with Command+Option (or just Command).
However, Excel does not indicate in advance which combinations are already assigned to built-in shortcuts. Because many combinations are already reserved by Excel and macOS (for example, Command+C, Command+V, and Command+S), the practical approach is to choose a less commonly used letter.
Here are a couple of ways to handle this on a Mac:
- Add the Shift Key: Hold down the
Shiftkey when assigning your letter (making it uppercase). This creates aCommand+Option+Shift+Lettershortcut, which is much less likely to conflict with standard built-in commands. https://support.microsoft.com/en-US/Excel/run-a-macro-in-excel - Use Application.OnKey: If you need more control over shortcut assignments, you can use VBA's
Application.OnKeymethod to map a wider range of key combinations. Just keep in mind that support for certain key combinations can differ slightly on Mac compared to Windows. https://learn.microsoft.com/en-us/office/vba/api/excel.application.onkey
Hope this helps.
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