Assuming it's an Excel workbook, you simply insert however many empty rows you need before the first data row. IMHO, though, unless you're only merging a few rows at a time, resulting in a large proportion of unused rows, it's not worth the effort. If you're working with the same few rows each time, you may even do better to merge multiple copies of the same labels in one go, or to forego mailmerge and link the cells to Excel, then move the links in the Word document to whatever cells you want to print on.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]