nfe_if_category is a conditional tag that works complementary to the built-in if_category tag.
The tag outputs inclosed content if the loaded page belongs to a specified category or any of its children. This allows you to define ‘parent’ categories able to work as ‘sections’ work right now.
The tag accepts 2 attributes: parent and exclude. exclude accepts a comma-separated list of categories not to include in the list of children. If set to the same as parent it will select only the children.