It appears at the start of the reference and is enclosed in square brackets. So if you were referencing cell B2 in a workbook called Sales and on a sheet called North, the reference in full would be as follows:
=[Sales]North!B2
The name of the workbook will be enclosed in square brackets, indicating it is another workbook.
Include the external workbook (surrounded by []) and worksheet names (followed by !) in the formula:=SUM([workbook.xls]worsheet!A1:A23)
It is a reference in one workbook to a cell or range in another workbook. So the reference is outside, or external to, the current workbook. To do it involves having the name of the workbook in square brackets, then the name of the sheet, then an exclamation mark and then the cell reference. So it could be something like this: =[Invoices.xlsx]Sheet3!C14
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An absolute reference.
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As you are typing it in, formulas are checked for errors of syntax. If a formula is working, you can see how it works in stages. It is known as being evaluated. A formula can be evaluated using a built-in facility.
Excel continually reviews the workbook for errors in formulas as you create or manipulate it
You have to add it into the formula box and then there is a button on the top that can do it for u
The Formula bar will do that and you will also see them in the actual cell.
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