The structure of each group is designed by the Group Administrator.
All headings added by the group administrator appears as black. However, they will not appear to the group viewer unless they have added a file here. Nevertheless, you can see this structure by going to the Add/Edit headings button.
Example: The Wiley Research Database structure is as follows:
Members can add their own titles as directory names or file names under certain headings, then they can upload their files.
See Add new Headings and Upload Files for more details.