Hello eKatherine, and welcome to TalkGraphics.

I just checked the Printer Setup dialog on my computer, and there's no Custom option for paper size. I think that must be coming from your printer driver. Will your printer physically handle 12"x22" sheets?

I don't believe XDP has a function for tiling parts of an image across multiple sheets. The print driver I'm looking at does have that function, but it's in the print driver not XDP. If your print driver has something like that, you may be able to combine it with XDP's Print Options : Print Layout tab to get close to what you want.

Allison