Multiple drop-down selection

I want to repeat the group “A” as many times as the list count of group “B”,
in other words I want to select a element in the dropdown every time as many as list length of group B and map them to a create list…! how do i do it…?

In case u need the file:place family by cad.dyn (41.4 KB)

The easiest option would be by providing multiple messages. This will also make the picking a lot more informative for the end user:

However I strongly recommend you check out the wonderful Data-Shapes package. With it, you can compose rich and descriptive interfaces and it sounds like that’s what you’re aiming for here.