Oracle Datapump Parameter REMAP_SCHEMA

Loads all objects from the source schema into a target schema.

Syntax
REMAP_SCHEMA=source_schema:target_schema

Suppose that you execute the following Export and Import commands to remap the hr schema into the scott schema:

expdp SYSTEM/password SCHEMAS=hr DIRECTORY=dpump_dir1 DUMPFILE=hr.dmp

impdp SYSTEM/password DIRECTORY=dpump_dir1 DUMPFILE=hr.dmp REMAP_SCHEMA=hr:scott

In this example, if user scott already exists before the import, then the Import REMAP_SCHEMA command will add objects from the hr schema into the existing scott schema. You can connect to the scott schema after the import by using the existing password (without resetting it).If user scott does not exist before you execute the import operation, import automatically creates it with an unusable password. This is possible because the dump file, hr.dmp, was created by SYSTEM, which has the privileges necessary to create a dump file that contains the metadata needed to create a schema. However, you cannot connect to scott on completion of the import, unless you reset the password forscott on the target database after the import completes.

Configuring Oracle Workflow for OWB

Please read http://sanjayabalasuriya.wordpress.com/tag/oracle-workflow-configuration-assistant/.