You can use the Category profile to create your own, customized hierarchical categories within your collections. Here's how:

• While editing or creating an Entry, at the "Category..." property, click the "+" button at the right.
• Give your new Category a name, and if you wish, a description and even “also known as”.
• Attach it as a "Subcategory of..." a "parent" Category you'd previously created, or create the new Parent category.
• Click "Create" in the upper right-hand corner.

Video Resource - Using the Hierarchical Category Profile