Currently there is no way to copy existing and navigations from one catalog to another. As schools move to a new catalog year, their only option to create a new catalog is to hit the "new catalog" button, which creates a catalog with no pages.
Unless we create a feature to automate this, the CS team will have to reach out to Tim/Nick to copy in all of the pages from an existing catalog, so we could save a lot of time down the road by adding a field in the "New Catalog" modal that allows the users to select an existing catalog whose pages they would like to copy into the new catalog.