VLookup with multiple results adding values

Question

I would like to lookup a value in another excel file that will have multiple results as rows. For example If the specific value is found in the column A of that row I want to add the number in column c to a total and then output that.

Book 1 VLookup from this sheet :

Book 2 Vlookup destination:

Desired Result:

I would normally add what I have tried, but im completely stumped, the only real formula ive tried is a standard VLookup. The Watered down question is "Need to know: how many sales per unique sku?"

Answer 1

As @BigBen suggested in the comment, use =SUMIF() formula.

in a pseudocode: =SUMIF(range_to_check, product_name, sales_amount_range)

So with the following data:

The formula in E1 which you can drag to other cells in the column would look like:

=SUMIF(A1:A6, D1, B1:B6)