Creating your own product category is simple. To get started, navigate to the profile of any product in your workspace, hover over the category name in the Product Details section, and click the pencil icon.
From here, enter the name of the new category you wish to add in the text field. When entering a category name that doesn't already exist in your workspace, you'll have a new option in the drop down that says Create new Category.
Click the Create new Category button and Save Changes to finish creating the new category. This new category will be assigned to the product you've selected. Note that there is currently no way to delete categories from a workspace.