Multiple "SUM IF" functions in one formula??

[Dax]

I know it can be done, Excel can do anything but I'm not sure if I can
even explain it.

For example, I want column D2 to display a qty IF a customer number
equals a specific value AND a part number equals a specific value.

Basically Column A is a list of part numbers, and Row 1 is a list of
customers. I need to pull how many parts each customer has ordered.

 

[Frank Kabel]

Hi
see:
http://www.xldynamic.com/source/xld.SUMPRODUCT.html