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This is much easier in OmniOutliner 4 than it was when this thread was originally created, since OmniOutliner 4 has the new Resource Browser interface that we proposed adding earlier in this thread.

Select Resource Browser from the File menu, and then use the gear menu at the bottom to "Add Resources to Library", "Edit a Copy", create a "New Template", or even "Show in Finder" if you need to do something that the Resource Browser doesn't know how to do.

Hope this helps!