|1||From the File menu, select Publish to PDF, and click the Settings button:
|2||Click OK to return to the “Publish to PDF” screen to complete document production. The compatibility setting will remain set to PDF/A until you change it.|
|3||Select PDF/A-1a from the "Compatibility" drop-down and click OK:
|4||Click OK and then Save to save the document.|
A video walkthrough of this process is below.