In the Description field type Press-Ready PDF (or any description you like). The Adobe PDF Settings dialog box will display, in the General section. Under the Settings menu select Edit Adobe PDF Settings. By selecting the PDF/X-1a setting first, many of the fields for your custom Press-Ready PDF setting will be already filled out.
To define a new Press-Ready PDF setting, open Acrobat Distiller 9, and set the Default Settings: pop-up menu to PDF/X-1a:2001. Create a New Adobe PDF Setting Based on PDF/X-1a:2001 To make the process of distilling your PostScript files fast and consistent, complete the following simple one-time steps to create your own Press-Ready PDF settings. You will be able to select this setting each time you distill a PostScript file. We are going to show you how to make your own press-ready PDF setting using the Edit Adobe PDF Settings… function in Adobe Acrobat Distiller 9.