I recall answering a similar question somewhere else recently. The simple answer is that Word has no native facility for offsetting the vertical positioning according to Section number. Although you could generate the odd/even layout as described, with textboxes holding the page numbering fields, you'd need to have each Section unlinked from the previous one and the textboxes for the new Section re-positioned.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]