Here's a quick overview (covered in more detail in the help files):
- Select File | Prepare File for Printing Service... | Create File in PostScript...
- Click the desired Printer/Printer Driver (if not already selected).
- Make sure the Print File box is checked.
- Click the Properties tab and change any default settings if needed.
- Click OK
- Give the file a name
- Click OK
- Publisher creates a PostScript file.
Additional considerations:
Check the Help files for specifics of creating Encapsulated PostScript if CMYK separations are required.

