To create a Save search, Go to the navigation list>search>saved searches>new.
Choose the search type as Transaction.
In Criteria Select Type –> Salesorder.
set mainline is true and Cogs and shipping Line will be False.
In results tab, from the joinfield related credit memo select amount and set Summary Type as ” Minimum” and Function as “Absolute value”.
In available filter, Select Internalid .
The Search will produce the credit memo amount.