Hi experts, I need to collapse a worksheet that consists of raw data roughly like follows col1 | col2 | qty | amount A | B | 1 | 2 A | B | 3 | 4 C | D | 5 | 6 C | E | 7 | 8 You'll notice there are duplicate entries in the list. I need to collapse non-unique combinations on col1 and col2, and get...