Hello @Benoit,
Thank you for reaching out to Atlassian Community!
The steps to bulk change organizations on Jira Server are basically the same as the Cloud version. I tested here on Jira v8.15.0 and Jira Service Management v4.15.0.
To bulk share tickets with an Organization, go to Issues > Search for issues > Filter the desired tickets > Tools > Bulk change all X issues.
On the next screen, select all issues > Next > Edit issues > Next > Change Organizations > Next > Confirm.
If you are facing any issues, please, share a screenshot with us.
Also, let us know the version you are using, so we can check if the feature is available.
Kind regards,
Angélica
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