How do I create a drafting view subfolder in the Project Browser?

[cory.simons]

In my Project Browser, my drafting views are located in a folder called "Drafting Views (Detail)".  I want to create new folders, such as "Drafting Views (A1)" and "Drafting Views (A2), and then put any details that could go on an A1 sheet in the A1 drafting views folder, any A2 in the A2 folder, and so on.  How do I create a drafting view subfolder in the Project Browser?

[Avaris. · Accepted solution]

Add a parameter to your sheets to indicate to which subfolder it belongs, make use of the grouping functionalily of the project browser. This article will give you in depth information on how to do that.

[quentinrov]

This doesn't explain how to create a subfolder under Drafting Views specifically. I would like to know how to keep the default Project Browser and just add subfolders. 
Currently I have (from Structural Template)
Structural Plans
Floor Plans
Ceiling Plans
3d Views
Elevations
Sections
Drafting Views

[ToanDN]

https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2018/EN...

[brookeHVFCJ]

I know I'm commenting on this much later than the post. But I think I've figured out an alternative to the same solution everyone keeps referring to. So hopefully this might help someone in the future.

Below is a screenshot of what I think you might be wanting to achieve:

So the screenshot still shows the generic revit folder categories however you can organize them with "Building Works" - "Door Details" - "Floor Details" - "Slab Detail" etc

1. Select the drafting view you want to put into another folder in the project browser. Once selected, click edit type in the properties browser.

2. Duplicate as normal, re-naming as you wish. 

3. The project browser should show the new default folder with alternative name. 

4. New drafting views added from the view tab and create window can be categorized by changing the type of drafting view in the properties browser.