SQL> conn / as sysdba
Connected.
SQL> 
SQL> doc
DOC>  Creating Application Container
DOC>#
SQL> create pluggable database pdb_dyn_syn
  2    as application container
  3    admin user pdb_admin
  4    identified by oracle
  5    roles=(DBA)
  6    default tablespace users
  7  	 datafile size 10M autoextend on;

Pluggable database created.

SQL> 
SQL> alter pluggable database pdb_dyn_syn open;

Pluggable database altered.

SQL> 
SQL> alter session set container=pdb_dyn_syn;

Session altered.

SQL> 
SQL> doc
DOC>  Install new application
DOC>#
SQL> alter pluggable database application appl1 begin install 'v.1.0';

Pluggable database altered.

SQL> 
SQL> create user app_owner identified by app_owner;

User created.

SQL> 
SQL> grant create session, create procedure to app_owner;

Grant succeeded.

SQL> 
SQL> conn app_owner/app_owner@'localhost/pdb_dyn_syn'
Connected.
SQL> 
SQL> create or replace procedure p2
  2  is
  3  begin
  4    dbms_output.put_line($$plsql_unit);
  5  end;
  6  /

Procedure created.

SQL> create or replace procedure p1
  2  is
  3  begin
  4    dbms_output.put_line($$plsql_unit);
  5    p2;
  6  end;
  7  /

Procedure created.

SQL> 
SQL> conn sys/change_on_install@'localhost/pdb_dyn_syn' as sysdba
Connected.
SQL> doc
DOC>  Finish application installation
DOC>#
SQL> 
SQL> alter pluggable database application appl1 end install 'v.1.0';

Pluggable database altered.

SQL> 
SQL> doc
DOC>  Clone Application Root PDB
DOC>#
SQL> alter user app_owner set container_data=all container=current;

User altered.

SQL> 
SQL> create pluggable database pdb_dyn_syn_dev1
  2    admin user pdb_admin
  3    identified by oracle
  4    roles=(DBA)
  5    default tablespace users
  6  	 datafile size 10M autoextend on;

Pluggable database created.

SQL> 
SQL> alter pluggable database pdb_dyn_syn_dev1 open;

Pluggable database altered.

SQL> doc
DOC>  This container does not contain any data after the time when the installation started
DOC>#
SQL> 
SQL> alter session set container=pdb_dyn_syn_dev1;

Session altered.

SQL> 
SQL> exec app_owner.p1
BEGIN app_owner.p1; END;

      *
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00201: identifier 'APP_OWNER.P1' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored


SQL> 
SQL> doc
DOC>  Let's synchronize the App PDB and transfer any in-flight changes from the parent application
DOC>#
SQL> 
SQL> alter pluggable database application appl1 sync;

Pluggable database altered.

SQL> 
SQL> set serverout on
SQL> exec app_owner.p1
P1
P2

PL/SQL procedure successfully completed.

SQL> 
SQL> doc
DOC>  Let's change the procedure within the Application PDB
DOC>#
SQL> create or replace procedure p1
  2  is
  3  begin
  4    dbms_output.put_line(sys_context('userenv','con_name')||'.'||$$plsql_unit);
  5    p2;
  6  end;
  7  /

Warning: Procedure created with compilation errors.

SQL> 
SQL> exec app_owner.p1
P1
P2

PL/SQL procedure successfully completed.

SQL> 
SQL> doc
DOC>  Now I am about to upgrade the application
DOC>#
SQL> conn sys/change_on_install@'localhost/pdb_dyn_syn' as sysdba
Connected.
SQL> 
SQL> alter pluggable database application appl1 begin upgrade 'v.1.0' to 'v.2.0';

Pluggable database altered.

SQL> 
SQL> conn app_owner/app_owner@'localhost/pdb_dyn_syn'
Connected.
SQL> 
SQL> create or replace procedure p2
  2  is
  3  begin
  4    dbms_output.put_line('v2.'||$$plsql_unit);
  5  end;
  6  /

Procedure created.

SQL> create or replace procedure p1
  2  is
  3  begin
  4    dbms_output.put_line('v2.'||$$plsql_unit);
  5    p2;
  6  end;
  7  /

Procedure created.

SQL> conn sys/change_on_install@'localhost/pdb_dyn_syn' as sysdba
Connected.
SQL> alter pluggable database application appl1 end upgrade to 'v.2.0';

Pluggable database altered.

SQL> 
SQL> doc
DOC>  Let's check if something has changed in the App PDB
DOC>#
SQL> conn app_owner/app_owner@'localhost/pdb_dyn_syn_dev1'
Connected.
SQL> 
SQL> set serverout on
SQL> exec p1
P1
P2

PL/SQL procedure successfully completed.

SQL> 
SQL> doc
DOC>  Sync
DOC>#
SQL> conn sys/change_on_install@'localhost/pdb_dyn_syn_dev1' as sysdba
Connected.
SQL> 
SQL> alter pluggable database application appl1 sync;

Pluggable database altered.

SQL> 
SQL> conn app_owner/app_owner@'localhost/pdb_dyn_syn_dev1'
Connected.
SQL> 
SQL> set serverout on
SQL> exec p1
v2.P1
v2.P2

PL/SQL procedure successfully completed.