Building a workflow and when a user moves through this workflow one of the options given to them is already a project that has been created. Is there a way when they move to that option it then links/takes them into the other project.
No, there's no way to do this (at least, not in a sane way)
Moving an issue is a structural change, it should never never be part of a standard process. It should only be done while housekeeping, or when someone has genuinely just got the wrong project. It is never something you do in a workflow.
The might be use cases such as HR/onboarding where there is a number of projects (HR, Finance, IT, Facilities etc) where a single status change in one project (hire approved in HR) might create/update issues within some/all of the other projects. To achieve something like this, you could look at a UI based automation (Automation For Jira / A4J) or a lot of scripting in the workflow.
Both of those options have pros and cons - some to consider (YMMV)
CCM
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