I have a master list of items in a database table. I want to be able to allow the user to select 1 or more of theses items and stored them in a 1:MANY table. For example: If I have a list of cars, I want the user to be able to scroll through this list and highlight those of interest, then save them to a user list of the highlighted cards.
Did you try the reference set selector? You would need to have a many to many association between your user account entity and the car entity, after which the requested functionality can be added easily.