Given that we call previously established functions by the following method....

Get {method-name} [of {object-ID}] {param1 … paramN} To {receiving-variable}

How might we call a pre-established {method-name} from a value found in File.FIELD rather than naming the function explicitly? We are applying conditional rules to import data and being able to do so would avoid the creation, use & slowdown of a very large CASE statement being called at least 1M x/day.