The Sum (Average) of numeric values in linked issues custom field allows you to define the value range for the number custom field type.
Create and configure the custom field
To create and configure the Sum (Average) of numeric values in linked issues custom field, you must be logged in as a user with Jira Administrator permissions.
Go to Apps → Manage your apps → Custom Field Suite
Click on Create custom field button on the right side of the screen.
Select Sum (Average) and click Next.
Name and add a description to your field then click Next.
Define Sum or Average, Issue Type, and Numeric field you want to use.
Associate the field to the appropriate screens and click Create. You must associate a field to a screen before it will be displayed.
That’s it! You can now navigate to your issue and enhance it with Sum (Average).
