Is there any documentation on creating a custom preset?
I see some information on adding and removing presets but nothing along the lines of maybe copying, modifying and renaming an existing preset and then adding it via functions.php.
Check out the thread below. It discusses a lot about presets.
Let us know if you need anything further!
Is there an article that explains how to create a preset from scratch, what folders & files need to be in the child theme folder, etc?
The info found here is pretty much what needs to be done to add a preset. You can put that code in your functions.php file.
Is there something in particular about that you’d like clarification on? Let me know!