Podcast intro and outro for multiple clips

Yes this can be done using the Batch Process from the Edit menu in Audition. To do so you first have to create a Favorite to add the files. See my post in Batch combining (mixdown) one file with thousands of others on how to go about doing this. In your case you will have to add extra steps to add the Outro. In the above linked example A is your Intro audio file. To add the Outro Mix Paste steps to the example after you have clicked Run (before Stop Recording Favorite) click at the end of the file to remove the Intro selection and move the Playhead to the end of the file. Then go to Mix Paste once again and add the Outro file to the From File box. Click Apply and then move the Playhead back to the start of the file. You can then Stop Recording Favorite and give it a suitable name. Then follow the example instructions for using the Batch Process.