Hi @Gan Zhi Long , the ability to change the field type is not supported. Depending on the details of your specific situation the best option to try is to create the new custom field and then run various JQL queries based upon the old field's values and bulk update the issues setting the new issue value. You might even be able to automate but that might be more work than it is worth.
We often have questions from folks using Jira Service Management about the benefits to using Premium. Check out this video to learn how you can unlock even more value in our Premium plan. &nb...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events