Categeries are Folders in which you have manage your different assets ( See also : https://stockito.com/help/category-management )
You can create a MAIN CATEGORY and a SUB-CATEGORY. That can be for example PHOTOGRAPHY > STOCKPHOTOS.
To create MAIN CATEGORY click in your left menu on "Categories/Folders" and then on the green "PLUS SYMBOL" on the top right page.
A popup appears and you can setup a NAME for your new MAIN CATEGORY.
To create SUB CATEGORY click again in your left menu on "Categories/Folders" and then on the green "PLUS SYMBOL" on the top right page.
A popup appears and you can setup a NAME for your new Category. To create a Sub-Category you need to preselect a Main-Category first and then create a name.
In this example we are creating a Sub-Category "STOCKPHOTOS" for the Main Category "PHOTOGRAPHY"