Have you tried "Center Across Selection"?
Select the range, then:
<Format> <Cells> <Alignment> tab,
Expand the "Horizontal" window, and click on the last option
"Center Across Selection".
You could also click on "Wrap Text" if you wish.
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HTH,
RD
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Please keep all correspondence within the Group, so all may benefit!
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This would be a general improvement to allow wrapping text over several
columns without the need to merge these cells. merging has limitations.