Audition 13. How to automate selecting a set amount of audio at the head of a bunch of files?

I have a hunch there's some way to automate the process of selecting the first or last x seconds (say, 40 seconds) of an audio file in Audition 13 (Mac). I've tried a few things & haven't yet hit upon the magic wand. 

Usually my projects have 15 to 45 files. I want to quickly zoom in on the start of each file. The files do not arrive with a marker at the zero mark. Any suggestions?

The one way I tried to set up a Favorite didn't work. Hmmm. I could try setting up a Favorite macro to set markers for 00:00 and 00.00.40 and select the span of time. And then another favorite to delete the extraneous markers afterward. I do not know if the Favorite recorder will perceive those actions to be recordable, of course, till I try. And that would not help zoom in at the end of the files, which are of variable length, though I could try using the end of file navigation button. (Thinking aloud. Constrained from testing alternatives at rhe moment.)

Better ideas?

I've just upgraded my laptop and so jumped a few versions of Audition...getting used to the new tool sets as well as the gestures on the touchpad and the Catalina MacOS. 

P.S. I rarely post to ask for help from the community & therefore am ignorant of the etiquette niceties. Please forgive any faux pas.

Thanks in advance for your suggestions.