Hi pjperez,
Thank you for using the Support Forum. Please take a look at printing exception pages on page 68 of the User manual. There you will find the steps for using different paper sizes for different pages in the document. If this does not help please consider contacting your support centre for further assistance.
I didn't see any answers to this, so I figured I'd put it out there:
I have a Phaser 7800GX with pro finisher. Does anyone know if it's possible to set up a print job to print from two different trays at once and deliver, collated, to the finisher? I think this is blue sky/wet dream territory here, but if so, it would greatly streamline some of our production, especially for booklets that have different cover and interior stocks.
Thanks!