I finally managed to create the two parts (Schematic and layout) I need. Then I did something stupid. I decided to ‘clean up’ the part directory with files I though were junk from failed attempts. Of course KiCad threw errors about those files not being found, and my parts disappeared. However, I found a Zip file which looks like a backup of my parts.
What I would like to do is create a new project and import those backups into my project. How do I do that?
Create a new project and name it. File > New Project.
With your Operating System find and open the the backup files.
Open the Schematic. select File >Save As change the name up top to your new project name and using the column on the left, navigate to the New Project you just created.
Highlight the New Project but don’t open.
Save. A pop up will read “already exists, do you want to replace?” Click Replace.
Go back to the backup files, open the PCB and do the same as you did for the Schematic.
You will now have a new project with a Schematic and PCB that were backup files from your old project.