Is there already some data in your sheets ?
The easiest way is to group sheets by clicking all necessary tabs while holding down the shift key


Any change on the first sheet is then reflected on the others.
Do not forget to ungroup when you're done

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Peco, I've never heard of that, but it sounds useful. Does it copy data, too? I mean, when I have several sheets grouped as you describe it and then type a new value into A1, does A1 change on the other sheets too? Or does this apply only to cell size, items in the Format-Cells dialogue etc?