Problem description & analysis:

There's a tree structure Excel table, where the Epic column is the highest data layer.

Task: Group rows by Epic, the highest data layer, and summarize the Hours column while keeping the Code column. Below is the expected result:

Solution:

Use SPL XLL to perform the computation:

=spl("=E(?1).group@i(Epic!=null).new(Code,Epic,ifn(~.sum(Hour),0):Hours)",A1:E10)

As shown in the picture below:

Explanation:

group@i function performs the conditional grouping. Symbol ~ represents the current group; new()function creates a new table; ifn() function returns the first non-null member (return 0 when the aggregation result on the current group is null).