Well, with a thread title like "Changing rows into columns" I can't imagine how anyone could be expected to know it wasn't already a table; after all, rows and columns are table elements, not part of the ordinary content of a document, which basically has only lines and paragraphs.

Given that it's just lines of text, you might start by converting it to a table, via Insert>Table>Convert Text to Table, specifying the space character as the 'Separate text at' attribute. Then follow the rest of the steps from my previous post.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]