Creating postscript files - Indesign, CS 5.5, Snow Leopard

I have a user in Snow Leopard, CS 5.5 who is trying to print custom sized docs as postscript. She can do this fine in Quark, but when she tried in Indesign it either has "custom" greyed out or it generates a document that is still 8.5 x 11 and is chopped off.
My Mac background is not strong - what should we look at?
She says that she used to have more printers on her list than she has now, and another user is showing more printers in her drop-down selection. But the printer the other user is using calls itself "Adobe 8", and if having Acrobat installed isn't enough to generate whatever the problem user needs, I'd need to know what to do.
GlennSimpson2Asked:
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Sigurdur ArmannssonDesigner Commented:
In the Print dialog when you select the second pop up button from top, Printer, it should say PostScript® File at the top of the list.

It it is not available you could use File>Export>EPS. It does relatively the same kind of a file (Encapsulated PostScript).
But why do you need a PostScript file? Most printeries use PDF as a final output and you can make a PDF directly via the File>Export>Adobe PDF (Print).

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GlennSimpson2Author Commented:
The final output they need is a multi-page PDF with each page being a separation to be burned to printing plate.  The only way our artists know how to generate this separations PDF is to go through the Postscript stage in between.
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