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Linking Cells, Sheet Tabs & Files
You can link multiple worksheets within a workbook and you can link multiple workbooks. You can do this by writing a formula in one workbook that refers to a cell, range, or name in another worksheet tab or workbook file. The benefit of this is if the data changes in one location, all linked cells will automatically update accordingly.
Absolute Reference is when you anchor a particular cell(s) in your formula. When you copy an absolute reference to another location, Excel does not change the absolute cell reference. However, the reference will change when it is a Relative Cell Reference.