I don't see how this pertains particularly to Service Desk, since post-functions are attached to workflow transitions. But no, there are no native shortcuts to re-use post-functions in other transitions. Not in the API either. I could have used that once or twice.
There are precious few plugins out there that would help. This one seems to have a simplified form to configure workflows, but it's not free, and doesn't seem to allow a straight up copy of an existing post-function.
My gut feeling is that there are no plugins that do that, for a good reason: The return on investment would be terrible. You don't need to configure post-functions that often, and saving a few minutes once in a while is not a good enough return to justify the price tag such a plugin would warrant. It's not worth the price for users, and not worth the time for plugin developers.
Also: If you were thinking of doing that in SQL, please don't.
Well, we have created an app for that :-) And I see a reason for such a feature. When deling with complex post-functions and complex workflows this can be very time-consuming.
With xTools for Jira you can copy&paste post functions from anywhere to anywhere. Not only Service Desk workflows.
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