Is there a way to create standard sub-folders? This would happen when a user is creating a new folder, it would look like this when they create the main folder,
If you are using the old Explorer client, you can create folders using a Space Template instead of a blank folder. A Space Template can contain folders and documents that are used as the starter content in a new folder created with that template.
Space Templates are not enabled in the Share UI, so if you are using Share, you would have to write your own script that creates the folders you want (or creates a folder from a Space Template) and then trigger that script from a rule.
All of these topics–Space Templates, server-side JavaScript, and rules–are covered in the docs if you need more details.