Not really sure what you want to do but...
Normally if you change the EPIC Name of the EPIC that is linked to issues, that will automatically be changed the EPIC the next time you look at an issue that's linked to it.
If you want to link to a different EPIC, go into edit mode for that issue and delete the existing EPIC then replace it with a new one.
Hope that helps.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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