Named Page Setups are a way to preconfigure your plot settings, matching this sheet size with that plot device to produce consistent repeatable output.
You can preconfigure a layout for a specific paper size and plot device in Page Setup Manager. Named Page Setups are a way to store and recall all your plot settings for a particular plot device making it easier to reuse the settings on another layout or import them to another drawing. Preconfiguring a drawing template with named page setups is a key ingredient in your CAD Standard.
Here is a 3 min. video on how to create a named page setup.
Click HERE to view a document to help you develop a list of Page Setups you will need in your CAD Standard.
The Publish (or batch plot) command and Sheet Set Manager both make use of Named Page Setups.
Here is a 6min. video that explains the pupose and use of Page Setups in the context of Sheet Set Manager.