Step and repeat impositions use a dynamic layout engine that follows a set of predefined rules to lay out pages onto their slots on the sheets. These layouts are mostly used for printing runs where many copies of the same item are to be printed on any single sheet of paper. E.g. to maximise the use of paper one may want to produce a batch of business cards by printing eight cards per sheet of A4 or US Letter sized paper. If, say, 80 cards are required, an imposition template would be set up that creates a 2x4 grid of slots on the sheet by specifying two columns and four rows, with one step and repeat rule that specifies that page 1 of the original document is to fill ten sheets. A layout may specify any number of rules to achieve more complex step and repeat effects.
For more information see the entry on Page Distribution
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