According to Microsoft’s documentation
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On the Tools menu, point to Macro, and then click Macros.
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In the Macro name box, enter the name of the macro you want to assign to a keyboard shortcut key.
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Click Options.
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If you want to run the macro by pressing a keyboard shortcut key, enter a letter in the Shortcut key box. You can use CTRL+ letter (for lowercase letters) or CTRL+SHIFT+ letter (for uppercase letters), where letter is any letter key on the keyboard. The shortcut key cannot use a number or special character, such as
@
or#
.Note: The shortcut key will override any equivalent default Microsoft Excel shortcut keys while the workbook that contains the macro is open.
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If you want to include a description of the macro, type it in the Description box.
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Click OK.
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Click Cancel.