I use jira server with a lot of modifications.
Since server will not be supported in future, it needs to be migrated to cloud or data center.
Create a new cloud project with a new structure of issue and subtaks issue types (cause the actual one ist not the best anymore due to changed requirements) and try to import some values from the old server project?
Or migrate first and try to do some required changes in a second step?
I am not sure which causes more work for me (+downtime of the jira project).