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Hotaru, I checked our development database; it looks like this is one of the features under consideration for a future version of OmniOutliner, but it's not something that the current releases support, I'm afraid.

If you use the "Send Feedback" item under the help menu to send the support ninjas an email, we can add you to the appropriate item in the database, so the team will know you'd like to see this added, as well.