Sum up the SP of the issues under the Epic

[Uthra Narasimhan]

Hi

I have a Custom number field "Epic Sum up" and would like to sum the storypoints of the issues under the Epic and display in the Custom field.

I used the below rule with the below value , but . not sure how to copy the value to the new field as it gives me a different number when i update the SP.

{{issue.Story Points}}{{^issue.Story Points}}0{{/}} + {{fieldChange.fromString}}{{^fieldChange.fromString}}0{{/}} + {{fieldChange.toString}}{{^fieldChange.toString}}0{{/}