There is not really a specific "move between catalogs" function, but let's say you wanted to move from Catalog A to Catalog B. You could check the "Search" box for Catalog A, and the "Add/Modify" checkbox for Catalog B. You could then find the images that you want to move, select them and choose "Include in Catalog" from the catalog menu, once they have been included, you can uncheck the "Add/Modify" box from Catalog B, and check it for Catalog A, and you can then choose "Remove Items from Catalog" and they would be removed from Catalog A.