Seems like ModelID is the key to joint the tables. So, you'll hvae two asp files. The first one display the dbSelectbox of the ModelID. The second asp file takes the value selected from the dirst asp file and set a JOINed query via WHERE ModelID=xxx to display the grid containing the preferred fields of both tables. You can also try to use the template to fit the selectbox and grid on one screen.

Consider an upgrade to the DotNet version of ASP-db as there are many pre-programmed setup like SelectBoxForm which does this in one shot.

Frank