It is possible to export/import work-items from/to the jazz repository ?

We already have a repository that contains many things. Some are relevant,
some are not anymore. We would like to re-start a new repository from
scratch. There are however some work-items that we need to migrate. Rather
than re-create them, we'd rather export them from the old repository and
import them in the new repository. Is there a way to do this? As far as I
know, repotools exports everything.

We don't mind (in fact it's better) if the changesets are not kept, we just
would like not to recreate the posts manually.

Thanks,

Nicolas