Please note that if you would like to use Crucible with Jira then you shall use Jira Software, not Jira Core. The reason is that the 'Development panel' on the issue screen is available only for Jira Software. Note that the license for Jira Software includes functionality of Jira Core, see details here: https://confluence.atlassian.com/jirasoftwareserver070/jira-applications-overview-762877655.html
You can link Crucible with Jira running in the cloud. Please have a look at this article: https://confluence.atlassian.com/crucible/linking-crucible-to-jira-394464356.html
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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