Thanks for the responses. Based on the structure of the survey search() didn't seem to be an additive option. I tried adding the prompt, but had same results, as without. Unfortunately, there is no selection to use as precursor answer for relevance, as I understand it.
Solved. It is not beautiful, but I created an additional sheet in the csv file. Then, I manually move the information to that sheet when a project is completed. Save and update on ArcGIS online. This removes the choice from the drop-down menu and maintains the rest of the programming. Analogous to adding a new site. Thanks, again!