AWP supports the most common operations on categories which enables users with the according permission to create, modify and delete categories.
After navigating to the planned parent category the category's menu offers a menu item to create a new sub-category:
Clicking Create Sub-Category opens a dialog where the name of the new category can be entered:
The category is created after clicking the Create button and the category tree will automatically refresh itself to show the new category.
Navigate to the category to be edited, open the category's menu and select Edit 'Category Name':
Now the editor window appears showing the fields specified in AWP's Category View Set:
Also shown in this example screenshot is a failed validation which the user must fix before being able to save the changes.