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To help repurpose an entire document, InDesign CS6 provides the Alternate Layout feature. This automatically duplicates an existing layout (in this case the portrait-mode 'iPad V') to a specified page size or orientation (in this case the landscape-mode 'iPad H'). After choosing whether to apply Liquid Page Rules and other options, a new set of pages is generated and displayed alongside the original in the Pages panel.
In the above example, Guide-based Liquid Page Rules (light blue dashed lines) are used to determine which elements resize and which don't: the image is touched by a vertical but not a horizontal guide, and so only resizes horizontally; the column of body text is touched by both vertical and horizontal guides, and resizes in both dimensions (a Flexible Width text frame option also means it adds a second column in landscape mode); the pull quote has no guides crossing it, and remains unchanged in the new layout.