We can unplug the pluggable database from existing CDB and Plug it in a different CDB or in the same CDB, depending upon the required. While plugging you can keep the pdb name same as before or can give a different name.

DEMO:

Here i will unplug ORCL pdb and then plug it into the same CDP with different name ORCL_PLUG

Connect to the pluggable database ORCL and close it.
SQL> show pdbs

    CON_ID CON_NAME			  OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
	 2 PDB$SEED			  READ ONLY  NO
	 3 ORCL 			  READ WRITE NO
	 5 PROD_MN			  READ WRITE NO
SQL> alter session set container=ORCL;

Session altered.

SQL> select file_name from dba_data_files;
 
FILE_NAME
--------------------------------------------------------------------------------
/home/oracle/app/oracle/oradata/cdb1/orcl/system01.dbf
/home/oracle/app/oracle/oradata/cdb1/orcl/sysaux01.dbf

SQL> shutdown immediate;
Pluggable Database closed.
Connect to container and unplug pdb to a xml file.
[oracle@localhost orcl_plug]$ sqlplus sys/oracle@cdb1 as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Sat Aug 29 03:37:50 2015

Copyright (c) 1982, 2014, Oracle.  All rights reserved.


Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options




SQL> alter pluggable database ORCL unplug into '/home/oracle/orcl_plug.xml';


Pluggable database altered.



  1* select pdb_name, status from dba_pdbs
SQL> /

PDB_NAME    STATUS
----------- ---------
ORCL	    UNPLUGGED
PDB$SEED    NORMAL
PROD_MN     NORMAL
Now drop the pluggable database :
SQL> drop pluggable database orcl;

Pluggable database dropped.

PLUGGING:

 

Here i want to plug the pdb orcl to the Same CDP

 

Connect to root container in target database and create pluggable:
[oracle@localhost orcl_plug]$ sqlplus sys/oracle@cdb1 as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Sat Aug 29 03:37:50 2015

Copyright (c) 1982, 2014, Oracle.  All rights reserved.


Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options

SQL>  create pluggable database orcl_plug  using '/home/oracle/orcl_plug.xml' FILE_NAME_CONVERT=('/home/oracle/app/oracle/oradata/cdb1/orcl','/home/oracle/app/oracle/oradata/cdb1/orcl_plug');

Pluggable database created.
Open the PDB:
SQL> alter pluggable database orcl_plug open;
  PDB altered.

SQL> select name, open_mode, total_size from v$pdbs;

NAME			       OPEN_MODE  TOTAL_SIZE
------------------------------ ---------- ----------
PDB$SEED		       READ ONLY   870318080
ORCL_PLUG		       READ WRITE 4396023808
PROD_MN 		       READ WRITE  891289600