Add the workflow to the "workflow scheme"
Actually, not quite that simple, as the workflow scheme can't be edited while it's active. What you need to do is create a new workflow scheme (I'd copy the old one though), and add the new workflow into it, then you can go to the project and change the workflow scheme to the new one. Jira will run you through any migrations it needs to do if there are any (if you already have tasks in there and you're changing the status in the new workflow)
Nic you may have misunderstood the question. I do not want to change the existing workflow I want to have 2 workflows(1 for tasks and 1 for everything else) assigned to a project. I know it can be done as I have seen it on another project in the past. So it would be again 1 project but with 2 workflows assigned. Do you know how to add a second workflow?
As Jo-Anne says, that is what I just said. I've skimmed over making two workflows exist in one project (the link gives you a lot more detail), exactly what you asked for.
I think you are mixing up "workflow" with "workflow scheme".
Could you re-read my answer with those distinctions in mind?
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