Under the current cloud hosted version of Jira, we cannot allocate existing workflow schemes to new projects. Creating a new project creates a new workflow each time, which just generates more work to clean this up.
Earlier guides suggested using JIRA classic as an option when creating a project, however this is no longer available. See also:
https://answers.atlassian.com/questions/5702888/creating-a-new-project-creates-new-schemes-and-workflow.-how-to-stop-this
It's very rare that different projects will have different workflows. Its far more common for projects to share a common custom workflow scheme, which can be maintained across all the projects.
How is this best accomplished?