The JIRA Administrators have 2 levels, JIRA Administrator and JIRA System Administrator (higher). They are defined in the JIRA Global Permissions. The different is detailed on the link below (i'm not sure on the billing information) but it will be best if you can test with 2 accounts and see if you are happy with it.
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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