Try this earlier thread...
http://groups.google.com/groups?q=infopath+repeating+column&start=20&hl=en&lr=&i
e=UTF-8&selm=%23zpUyKM9DHA.2472%40TK2MSFTNGP09.phx.gbl&rnum=28

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Jerry Thomas[MSFT]
<Jerryth@online.microsoft.com>
Microsoft Office InfoPath
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> Is it possible to have a table in InfoPath to allow users to add columnts in
> addition to rows?