Groups in databases can be flagged as Favourites. Once flagged the list of favourites appears at the top of the Sorters navigate list. This is an easy way to drag and drop files into the sorter onto the desired group without having to navigate to the desired group in the database tree.
The option to flag a favourite is available in the Sidebar Navigate pane. Use the context menu to see the Favourite option. Show the Sidebar from the View>Sidebar menu option or the Sidebar icon.