The following example explains how to print a letter size document on ledger size paper.
Windows
< 2 steps in all >
Click the [Paper] tab and select the paper size for the print image (for example: Letter).
Select [Fit To Paper Size] and select the actual paper size to be used for printing (for example: Legal).

Macintosh
< 2 steps in all >
Select [Paper Handling] and check the paper size for the print image (for example: Letter).
To change the print image size, use the "Paper Size" menu that appears when [Page Setup] is selected.
Select [Scale to fit paper size] and select the actual paper size to be used for printing (for example: Ledger).