Editing existing categories:
Under this section you can edit and arrange all the categories of your app. This is where you can set the pictures that appear as an icon for each category on your mobile app.
Just click on the Title. You’ll see this screen:
Adding new categories:
To add a new category, just click on ‘Add New’ at the top of the 'Category' menu. Here you can create sub-categories – just click on the drop-down ‘Parent’ category list. If you don’t want to create a sub-category, leave this area blank.
To hide categories simply change the visibility to 'Hidden' and untick the 'Auto-sync' box, additionally, if there are any subcategories, please ensure that these are also set to 'Hidden' with the auto-sync turned off.