fetch opportunity records based on the stage name in lightning 

Hi all,

I'm trying to use Process Builder to change the Case Status upon a custom picklist field modification. I'd like to use the same status for multiple values of the picklist. Was trying to keep the assignment formula clean by using an OR inside the CASE statement but doesn't seem to work.

The formula would look like so:

CASE([Case].PicklistField__c,
    "Value1" OR "Value2", "Status1",
    "Value3" OR "Value4", "Status2",
    "Status3"
)

Thanks in advance!
Eno