Thanks for your question. At the moment themes are plan specific and can not be shared across plans.
If you think this would be a useful feature for Portfolio to have, you can suggest the feature here https://jira.atlassian.com/.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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