Copy project key all the way to subtask summary

[Ahbosch]

I want to copy the main project key example "AB-1" to a Task Summary to begin with AB-1 - summary, (Which I can do via automation), but then from that Task create a sub-task and again copy the AB-1 into the summary.

This way I can easily see what sub-tasks belong to each project.

This is my current automation call for the Project key:
{{issue.parent.key}} - {{issue.summary}}

I'm also trying to find a way to copy a custom field into the summary, but I haven't found a way yet. 

Any help on this would be appreciated. 

[Vishal Biyani]

@Ahbosch 

Using Create Issue Trigger you can check for parent summary and copy it.

Can you share the screen shot of your automation to understand the flow better?