You can use Content Importer to import content into Content Manager. The application runs in two phases: Conversion and import.
Conversion phase During the conversion phase, the following operations take place: validation of DITA content against the Content Manager DTDs; GUID generation; Content Manager condition generation; and creation of the filemap.xml file.
Import phase During the import phase, the DITA content is imported into Content Manager. The filemap.xml file specifies the metadata that is created in the repository.