How to copy the parent and child values from a cascading custom field to 2 separate custom fields

[Omari Ledeatte-Williams]

I have a cascading custom field and 2 separate single select custom fields. I want to copy the parent part of the cascading to 1 separate text custom field and copy the child part of the cascading field to the other text custom field. 

Copying the child part works correct via the JSU post function "Copy value from other field"

Copying the parent part I didn't find a solution yet. Who can help me? I am not experienced in Scrip runner coding, I could use your help there.

Thank you.

[Sandesh Shetty]

@Omari Ledeatte-Williams 

Please find the link for simillar requirement.