Using notepad is handy, I haven’t done much with it yet so not sure how it goes with teammates and different PC’s or projects, but you can copy a bunch of selected stuff and paste it into notepad, then copy from notepad and paste it into the UEFN viewport, just like copy and paste inside the editor.
If that works, then you can have a bunch of text files for dumping different asset sets into your project.
There was a good post about a year ago, where the poster discovered the hoops to jump through with Playsets, they have to be in a certain place or something.