I have two spreadsheets:
S1 is a product list detailing column A the product and column B the price.
S2 is a list of separate transactions detailing column A the date, column B the product and column C the quantity sold.
In S1 I want to be able to enter a single date in cell C1 and in cell C2 I need a formula to match A2 the product against all of S2 column B and return the total of the quantity sold in S2 column C but only on the date in S1 cell C1.
SUMIF()
or a Pivot Table.