Macro to count different part numbers

[backyardfun]

I need a macro that will count the number of different part #'s that each customer has on order. Attached is a sheet that has an example. I need the results I manually created in columns E & F to be done automatically from the date in columns A & B. Thank you.

[Joske920]

Hi,

a custom formula maybe ?

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[backyardfun]

Thank you!