How do I make a macro non-workbook specific, so that it works in any Excel file?

Hi Kathy, Thank you for your post, welcome to the forum, in answer to your question, when you are creating your macro, in the first dialog box after choosing menu command Tools>Macro>Record New Macro, in the Store macro in text box, use the drop down arrow choices and select Personal Macro Workbook. Record your macro in the normal way. Your macro will now be available to you whenever you open that PC's version of Excel.
To delete this macro you cannot use the normal method of deleting it from the Macro dialog box; The macro has been saved in a special hidden workbook, so you must first Hide the current workbook, Window>Hide, then immediatly go to Window>Unhide, you will see the Personal Macro Workbook displayed in the choices, open it and delete the Macro/s as per normal, Save the Personal Macro Workbook, and then Hide it as above, then Unhide your original Workbook, the macro will not be shown or operate. I hope that has helped, best regards Pete.