You can add existing releases as package references.
To reference an existing release to a package:
Log on to PPM.
Open or create a package.
For information on how to open a package, see Opening Packages from Standard Interface.
Scroll to the References section.
From the New Reference list, select Release, and then click Add.
The Reference Release window opens.
To specify the name of the release to reference in the Release field, select it from the auto-complete list, and then click Add.
On the Package page, the References to be added on Save field lists the referenced release.