Can the attribute value mapper transformer map multiple values in one record?

Do you have geometry associated with these records? If not, you could do something like this:

• Use an AttributeSplitter to create a list of those attributes
• With ListExploder, create separate features for each list item.
• Process those through your AttributeValueMapper, and then Aggregate the results (Group By set to _element_index, and Attributes to Concatenate set to _looked_up_reason_of_given_set).

If you do have geometry associated, the Aggregator may skew that. You could always Deaggregate after this workflow, I suppose.

If there is geometry, you can use a GeometryExtractor to temporarily save that to an attribute and then after aggregating a GeometryReplacer to rebuild it.

@dustin​ It worked great! Thank you! One las question, how do I get the new values into the original data? Right now when I run the workspace it only shows the new values I created.