Hi,
Need inputs on the below use case,
JIRA Workflow is , When the development is completed then the issue will be assigned to a Reviewer for code review and then will be assigned to QA for testing. We are creating sub-tasks ( porting the code fix to supported version ) using JIRA Automation when the issue is ASSIGNED TO QA and the sub-tasks needs to be assigned to the original developer.
I don't have the developer details when the ticket is assigned to QA ( As the assignee will be the code reviewer ) , Developer Name needs to be stored in a custom field and the same value needs to be fetched and assigned for the sub-tasks using automation
I am cloning to create sub-task , once the sub-task is created then I need to fetch the value from the custom field and use it as an Assignee for the newly created sub-tasks. 
I don't see an option to fetch the custom field value as part of the clone.
Thanks !!