I have a package ABC in which I have 3 procedures X Y and Z. I need to call procedure Y from procedure X which belongs to same package.
This forum, as the title says, is for Sql Developer questions only and NOT for SQL or PL/SQL questions.
If this isn't related to Sql Developer then please mark it ANSWERED and repost it in the SQL and PL/SQL forum
When you post there you should provide your database name and full version.
You also need to explain why you even need help since procedure X can just call procedure Y directly since they are in the same package.
For an Oracle DB see the documentation and examples in 'Using PL/SQL Packages' in the PL/SQL Language doc