Questions

This is done in three steps:
First - define your Categories in NUZ>Organize>Cats:
>AddNuCategory - give it a Name (this does not show on site) and set Category ID - this has to be unique for each (example: Category - Portrait, ID - 2, Category - Landscape, ID - 3), the CatType has to be Images, the Text field is optional - it can be set to display on your site.
Second - set your Menu Titles in NUZ>Publish>Text
>AddNuTextItem - give it a Title (example: Photography: Portrait), Type has to be Images, Cat has to match the Category set in Categories, Content is optional - it can be set to display on your site.
Third - set the Cat 2 on each image in NUZ>Network>Images to the relevant number (example: if you want the image to show under menu item Photography: Portrait, enter 2 into its Cat2 field.