Refactoring into Packages

How do I move some of the classes from one package into a new package? For example, I currently have package 'GSNApp', with lots and lots of classes. I want to create a package called 'GSNApp-DB' and move all the classes that have to do with the database into it. Looking at all the Squeak menus, I can't see any way to do this.
 
Thanks,
Richard

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