Hey guys, Pretty new to this platform.

I am trying to filter a dropdown based on the selection of a separate dropdown.

I searched through the forums and I get an error when I try to load the example apps that some very kind helpers have made stating the version is out of date or missing dependencies.

I basically have a few sites that have machines
so I need to select a site and the second dropdown needs to show the machines that belong to that site.

I have to DB's created.

1st has all of the sites 

2nd has a few test machines and I linked them by site ID.

do I need to create a 3rd empty db to hold the values after it's filtered and make the 2nd dropdowns source the 3rd DB?

if so how do I make the 3rd DB pull the new values depending on the site selected? 

any help would be greatly appreciated =)