As I have said a couple of times, now, you can adjust the column widths through the column width dialogue in the Table Tools context menu. See under Table Tools>Layout>Properties>Column.

PS: trying to have a single table that spans 200+ pages is ridiculous. You should be using Excel or Access for content like that. Word's performance will be seriously degraded if you ever get that lot into a single table, especially, if the table's 'Automatically resize to fit contents' option is checked.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]