Group works like folders. The Top Group is in the top level and the Sub Group is inside another group. The climate library items could be organized properly with these groups.
Create a top group by either of the two ways: 1) click the Top Group button in the toolbar; 2) right-click any empty place under the Library Explorer context menu, which is the right-side bar in the Resource Library, and choose Add Top Group.
After the group is created, rename it in the Basic Information. Follow the naming convention in your organization. A good practice is to use the source of the data, e.g. municipality and conservation authority. In this exercise, name is as “Test”.