Add / Edit Categories
Warehouse->Categories->[Add Category]

Overview
Here you can Add/Edit the categories depending if you clicked [Edit] or [Add Category] button.

You can add as many categories and subcategories you need. There are no limitations.
Though, you can choose between using a category for products or for other subcategories.
You won't be able to put both products and subcategories in the same category.

Elements
Category name
This is the name of the category as it will appear in the Store and in the Categories Manager page. You may change its place in the store using Categories Display Editor aaa
Category description
This is the description of the category as it will appear in the Store. You may change its place in the store using Categories Display Editor aaa

Category Image
Here will be the name of the image file that is already uploaded into the store images directory using Upload New Images page.
This image will appear near the category name and description in the Store section

By clicking on [Pick image] button a popup will open and you'll be able to select one of the images already uploaded using the Upload New Images page.

Links
From here you can:

Pick an image for the category [Pick Image] Image List page
Update/Add category [Update]/[Add Category] And go back to Categories Manager