We have a custom field in a parent issue type of "Release Engineer". When a status the status is transitioned from "Scheduled" to "Begin Prep" we'd like to have that custom field assigned to the subtask as the assignee.
Example
1. Parent Issue 1001 = custom field "Release Engineer" = JDoe
2. Sub-Task created by workflow.
3. "Additional Issue actions" section assigns new subtask = "Release Engineer" = JDoe.
I've tried many of the searchable solutions and none work with our script tool within JIRA, please help!