Unless there is an easy way to maintain keyword sets (see my difficulties with category splashers in this post - https://www.photools.com/community/index.php?topic=12505.msg88546#msg88546) I would very much welcome an easy way to build up keyword sets over time (add to as well as take out keywords from time to time) that can be applied to files at the press of a button.
Peter
Have you used Keyword Links (https://www.photools.com/help/imatch/thes_basics.htm?dl=kw_links) yet?
They do what you ask for, and lots more.
I've described how you can easily add/modify/remove individual categories from category splashers in your original post.
Although I always would prefer keyword links, and then make a Favorite for the root keyword.
Thanks Mario, I will experiment with Keyword Links.
Peter