how can I Set watcher based on Custom field using scriptrunner :
No, you need apps such as
Jira doesn't support project config migration out of box (only issue data), and scriptrunner only works locally.
Unless you want to invest time into whether trials work, or find some other apps, and hope that they work and don't break anything (because configs generally can be harmful if done improperly), manually copying it over would be the best bet.
Workflow you can export to .xml format and import them to your production, but the import process is not perfect - it could create a duplicate of your customfields and screens if you have any such transitions (so if you have transition screens, you would want to clean up a bit afterward). Although validators, conditions, functions and properties should carry over fine, so this might ease things up a bit.
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