Tell me how to make a stand for selecting the value of the Epik Link field has become another field in Jira Project? The field itself has 1500 values inside)))
Could you please clarify your question?
Are you looking to copy the value of "Epic Link" to another field as a scripted, read-only field? You will need a custom field plugin like JIRA Misc Custom Fields to script that.
If you are instead looking to create a second field that functions just like Epic Link, allowing users to select an Epic based on all epics in the instance, you will need a tool like Scriptrunner for JIRA (See https://scriptrunner.adaptavist.com/5.6.8/jira/script-fields/issue-picker.html)(Scriptrunner would also work for the first scenario).
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