Really sorry I couldn't help you, I'm sure a brain on here can though.

The only work around I can think of at the moment is to have your data source as an excel file with the headers already in place in Row 1 and use the Import Text option on the Data Table, use the wizard for the and tab delimiter and change the type (text, numbers etc) on that wizard in (Destination in Row 2). You could always copy and paste the excel worksheet into an word document if it is necessary for it to be word.