How to merge parts in BOM with same description

Hello,

I have an assembly with whole 3000x1500 sheets and all different cut sheets, all as parts. I would like to have a BOM with two rows:

part1, whole sheet, "quantity"

part2, cut sheet, "quantity"

Is it possible? I was trying to do it merging rows with same description but no success.

solidworks 2017.

SolidworksDrawings And Detailing