How to create a po from one supplier and many departments

I cannot find a way to create a PO based on 1 supplier and multiple departments. I tried the following but they don't work.

Department Name = Dept1

OR Department Name = Dept2

OR Department Name = Dept3

AND Supplier Name = Supplier1

and

(Department Name = Dept1

OR Department Name = Dept2

OR Department Name = Dept3)

AND Supplier Name = Supplier1