Thanks, hborre and davo. I've located the pose folders I want quick access to from Favorites, one at a time, opened them in the Library, Shift+Click to select all the items in them at once, then click the Favorites "Star" which opens the Favorites dialog. In that, I add a new folder, give it a descriptive name, and click "OK." A bit more cumbersome than just being able to drag a shortcut for an entire folder into Collections, which doesn't work in Poser, but this does the job without having to load up my drive with full copies of the target poses ... and it works!