Sum Content Cols

Key Sum Content Cols in CF Model refers to an optional 1D-array of titles that define the columns of which the values over any merged rows need to be summed up, as described in Unique Content Cols
Can be set by the user only when Column Choice = Custom
If absent, the default is an empty array, which effectively results in a sorted table, where all groups of to-be-merged rows are replaced by their topmost row, without any summation taking place.