You do not normally delete change packages; they are kept for historical purposes. However, if a change package is created unnecessarily, then you may want to delete it.
When you delete a change package, CICSĀ® Configuration Manager erases the change package and its associated records from the repository, and adds a record of the deletion to the journal. No records are deleted from the journal.
This allows you to immediately delete a new change package that was created in error, without leaving any evidence of the change package.