1. To group worksheets, hold down CTRL and click the sheet tabs of the sheets you want to group.
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2. Release CTRL.
Now you can edit multiple worksheets at the same time.
3. For example, on the North sheet, change the value of cell B2 to $1000 and delete row 4.
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4. Go to the other two worksheets and you'll see that these worksheets have been edited as well.
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