You haven't told us what you have configured to handle this "business units" thing.
I'm going to guess that it is a custom field you have added. If that is the case, you need to go to Admin -> Custom fields -> Business Unit (configure) and add the new options.
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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