Multiple Catalogs/Multiple Galleries: You can organize and view your catalogs in whatever way works best for you, including opening multiple Catalogs and creating multiple Galleries.
For example, you might want to create different catalogs for different types of items, or you might want to put all your items in one catalog, and create different Galleries to display them. Or you might want to locate (using keywords or the “Find” command) items meeting specific criteria and display them in a new Gallery—you can even save Galleries for future viewing of only those items.
For more information see:
Viewing Catalog Items in the Gallery
Moving and Copying Between Catalogs