How To Define a Procedure inside Another Procedure?

Define a procedure inside another procedure is supported by PL/SQL. The following tutorial script shows you an example:
SQL> CREATE OR REPLACE PROCEDURE HR.DBA_WEEK AS
2 PROCEDURE DBA_TASK (day VARCHAR2) AS
3 BEGIN
4 IF day = 'MONDAY' THEN
5 DBMS_OUTPUT.PUT_LINE('Checking log files.');
6 ELSIF day = 'FRIDAY' THEN
7 DBMS_OUTPUT.PUT_LINE('Rebuild indexes.');
8 ELSE
9 DBMS_OUTPUT.PUT_LINE('Reading some papers.');
10 END IF;
11 END;
12 BEGIN
13 DBA_TASK('MONDAY');
14 DBA_TASK('TUESDAY');
15 END;
16 /
SQL> EXECUTE DBA_WEEK;
Checking log files.
Reading some papers.
Remember that procedures used inside a procedure must be defined in the declaration block.