Migrating Packages from NuGet Version 2 Repositories
Moving From NuGet Version 2 to NuGet Version 3 covers creating new version 3 proxy repositories, but doing this does not allow you to migrate the packages that you have proxied or stored on the version 2 repository. If you would like to see these packages in the version 3 repository, you can use import/export and a new hosted repository as described below:
Create a new version 3 hosted repository.
Export packages from your version 2 proxy repository.
Import these packages to your new version 3 hosted repository.
If desired, combine a version 3 proxy repository (such as the one created in the Moving From NuGet Version 2 to NuGet Version 3) with your new hosted repository in one version 3 group repository.