This is a simple drop-down with greetings from a single local datasource

Multiple Datasources

This drops greetings and farewells from two datasources, labeled by headers and a custom output post processor (greetings append "!" to the chosen string)

Multiple Value Populate and Textarea

This allows a user to choose a greeting, then another, then another. Also can use textarea.

Remote Datasource

All example so far have been local arrays of data. Here is an example of a remote datasource (in this case, On-Demand Javascript) and how to process the output