You could use LCM method to migrate reports .The best way is to log on to workspace with the admin id and export all the reports ,All the reports would be exported in a .zip file format. then You can import them into your target via workspace.
Refer the urls below
http://docs.oracle.com/cd/E17236_01/epm.1112/fr_webuser_epm/import_fr.html ->Importing the FR reports into Workspace
http://docs.oracle.com/cd/E17236_01/epm.1112/fr_webuser_epm/database_manager_fr.htm ->Manage database connections for Financial reports