Is it possible in a post function, to be able to have the Create Screen from an issue type appear with all it's custom fields?
For example, I have two issue types in a project, Test and Concern. During the Concern workflow, I want to have a button that says "create Test"
When this button is pressed, I wanted all the original fields from the Test issue type screen scheme to appear. Is this possible?
Post functions have no front-end, they are part of a transition and do things without any interaction. So, no, there's simply no way to do that as a post-function. Even if you could, you have a problem with it - you're moving on to another issue's workflow, so you wouldn't want to do it as part of the current one anyway.
I would do this differently. I'd use script-runner to create a new button (web-fragment) with a "create" script behind it.
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