I've worked on other CMS's before and this is my first SS project. Is there a notion or creating PHP classes/models that map to fields in the back-end that don't necessarily map to a page? For example, creating global elements that are more of settings? For example, can I create a node in the tree called Main Nav and sub-nodes that solely represent nav links? These won't necessarily be pages though, but I would want to code my global template to call on these when making the top-level navigation. Does that make sense?

Also, FYI, I'm using SS 2.3.11, not the latest, because I need to use the Event Calendar module which is for that version.