I've had the most success combining two fields the following way
|eval CombinedName= Field1+ Field2+ Field3|
If you want to combine it by putting in some fixed text the following can be done
|eval CombinedName=Field1+ Field2+ Field3+ "fixedtext" +Field5|,Ive had the most success in combining two fields using the following
|eval ClearanceCode= NFC1 + NFC2 + NFC3|
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