Fredrik
Select one sheet tab then hold CTRL key and select another sheet tab.
Make a change on first sheet, like color a cell or three.
Second sheet will have same change made.
You can group all sheets by right-click>Select All Sheets or by SHIFT + Click
to select contiguous sheets.
Or by the CTRL + Click to select non-contiguous sheets.
Whatever method is employed, you will see [Group] up in the title bar and the
grouped sheets tabs will be colored white.
Very handy feature for replicating across sheets, but can get a little hairy
if user forgets about it.
No warning other than the [Group] and the white tabs.
Gord