I have a channel with entries in categories and subcategories. I want to output a list of only the entries that are not in the subcategories. Is there a way to do an "only A" or "A & not anything else" type of selection?
I'd look to use GWCode Categories. You have the same control over inclusions and exclusions but a whole load more on top.
excl_cat_id_children could be useful here if the categories are relatively fixed and you know their IDs.
Try Dandy Cat. it allow really crazy stuff on categories.
You can use the
You can exclude all child categories
or specify all parent categories