VideoStudio :: Combine Files With Different Properties?

I have three video files. Each has a different frames per second. Each has a different audio format. Each has different bit rates. One has upper field first, one has lower field first.

Im assuming that I cannot simply drop the three files into the time line and produce one output file (obviously with the lowest bit rate and fps).

Do I assume correct? and if so, how does one combine files with vastly different properties to produce one output file?