Hi, I have 50 customers on drop down and months on another drop down. I need a cell to be populated with unique invoice number for a certain customer for a certain month. I have tried the formula:
=IF(AND(A1="Cust A";A2="January";"CustA001")).
I have to do this for all 50 customers for january only. Is there a way I can use arrays maybe?
Please help.
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