How to do automatic transition without using post functions only by using custom fields
You don't.
Automatic transitions can only be done by Listeners, Post functions or external processes behaving like listeners and poking JIRA over REST.
could you give breif explanation about how to do automatic transition without any post function,conditions,validators and no automation ruyle only by using the custom field
No.
Please read the answer again, it explains why I can't.
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