How do I code multi-else's using mail merge? Example: I want whatever is
City to be Ucase, but evidently I can't use VBA code in mail merges, so I
can figure out how to make Seattle capitalized if City = Seattle, but how do
I add other cities? I have tried, but only get City instead of TUCSON:

{IF {MERGEFIELD City}= Seattle "SEATTLE" {IF{MERGEFIELD City} = Tucson
"TUCSON"} ""}

If City one of my "defined" cities, can I just merge, and let the field
stop and let the user manually type in (capitalized) City?

I hope my question is clear. TIA.