You can save your own configurations in this directory. They will not be deleted during the automatic MultiOS-USB update.
You do not need to create configurations from scratch.
Just copy the one you want from the /MultiOS-USB/config directory, paste it into this directory and update it according to your needs.
The updated configuration will be detected automatically.
Once you have created a new configuration or updated an old one, you can upload the changes to the repository and share the code here: https://github.com/Mexit/MultiOS-USB/issues