Inherit Radio Button field Value from Epic to Task

[Jagriti]

Please help:

I have a custom field on Epic called  "Business Focus" , with 3 options. The user will select one option.

When the user creates a (child of epic) Task , the value of the business focus must be inherited and displayed on the Task screen

I have tried post function , it does not work 

[Renni Verho]

I would try to do behavior to copy values to create screen. 

Unfortunately I did not find working solution for that yet.