Can I add Sub Groups to Display Groups?

Summary:

I'd like the ability to add sub groups to my existing display groups - is this possible?

Content (please ensure you mask any confidential information):

Here's an example of my display groups - the ask is whether there could be subgroups created underneath each one.

Version (include the version you are using, if applicable):

25C

Code Snippet (add any code snippets that support your topic, if applicable):