>In Word 6, I have a table with 10 rows and 5 columns.
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>Row 9 need to have column 5 on rows 9 and 10. Which mean row 10 does not have a column 5 because it is the same as row 9.
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>How do I proceed to have this feature?

you could turn the bottom line in row 9/top line in row 10 'off'.