Create an issue after transitioning an issue of the upper levels of the Advanced Roadmaps hierarchy and update its Parent Link field to link it to the transitioned issue.
Add a Create issue post function to the desired workflow transition.
Issue to be created
Choose Single issue
Choose Selected issue type and select any of the issues types that can be under the transitioned issue.
Choose the Parent Link field.
Select the option Copy field value from current issue and the field Issue Key.
Introduce the following expression after replacing the name of the issue type with the issue type of the transitioned issue.