Ok, that's a merge. not a migration (semantics, I know).
Have a look at the Jira Cloud migration assistant, it can help you move bits of one Jira into another Cloud instance and works with both Cloud and Server sources.
If that's not going to cover what you need, then I strongly recommend what @Prince Nyeche has suggested
Did you know that penalties up to 4 % of the yearly company turnover are possible in case of GDPR violations? GDPR regulations are currently mainly relevant for companies in the EU, but countries lik...
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