In the following use case we are going to move the current issue to another project.
Make sure this post function is the last one on your post functions list.
Add the Move issue post function to the desired workflow transition.
Choose Selected project and select one project from the drop down list.
Choose Retain the issue type
Choose Retain the status.
Select two fields to add:
%{issue.summary} - Moved from %{issue.project.name}
This issue has been moved from %{issue.project.name} to the current project. The issue key was %{issue.key}.
Move issue