Thanks again Ray for the wonderful support.
You are spot on and that sequence of pages is working fine.
Thinking back, first I created the select list working with your advice. Then I used Data Assist Pages to create the Results and Details but I could not get the Results page to open with any records.
I think that's when I changed $_GET["search-distinct"] to $WADAboats->getColumnVal("Manufacturer")
Now I have a working model I will create another similar test sequence to ensure I can!