Column A contains material name and Column B contains usage. I would like to
choose the name and the total usage of materials that were used. For
explanation purposes,

Column A Column B
Paint 30
Thinner 15
Paint 10
Thinner 5
Caulk 0

Therefore, the table will contain paint = 40 and thinner = 20. Caulk will
not be displayed since it had zero usage.