Creating new join records via relationships
This is similar to my previous post, but I had marked that post answered so pardon me if a new topic seems unwarranted.
In my previous post I had asked about creating new records in a child table via a relationship that 'never matched.' After playing around a bit with PhilModJunk's suggestions, I was surprised to find that this method also seems to work perfectly for creating new join records. I wanted to run this method by the community to be sure that I'm not missing some grievous error. I had been using scripts, but this method is much simpler for me. I've attached an image that lays out what I'm doing.
Edit: Corrected a mistake in image (edit 2: again)