Multiple fields in Rows

I have 2 fields in the rows of my pivot table
e.g.

Tests - 8 , 16
Test A - 5 , 8
Test B - 3, 8

Is there a way to remove the sum completely from the 1st row (Tests). I want only to show the values in the child elements.

You can use scheme $init for the DataTable of Pivot to clear properties that correspond numeric columns:

http://webix.com/snippet/605302ef