You can either allow the entire database to pass through the filter, or you can limit it to a particular selection of branches.

To work with the entire database, choose Unrestricted (all folders).
     
Top   Filtering based on a selection of branches
  By specifying one or more database folders you are effectively blocking out the rest of the database.

When you add a folder to the list it automatically includes all sub-folders within that folder, as indicated by the ticked box next to the folder name.
     
    Tip You can base your filter on a Virtual Folder if you wish. You can create a Virtual Folder at the end of the Wizard, containing everyone that passed through the filter. You can then refine that list still further by using it as the basis of another filter.
     
  Click the Search button to add a folder to the list
     
  Click the Delete button to remove a folder from the list
(This does not remove the folder from the database)
     
Top   Filtering based on the type of folder
    You can filter out particular folder types by ticking them in the bottom box, for example:

Allow Company folders through the filter

If this is ticked, then Companies will pass through the filter. If you are doing a MailMerge, you may only want to allow Contacts through the filter as your letter is probably designed to be sent to a person rather than a company.
     
    Note Virtual folders cannot be selected.