Hi, sorry by the late answer.
Najara is correct, although, for your aditional quesiton you need to combine all the models into one model to export it.
* Convert each model to editable poly (right click, convert to editable polygon)
* Look for the option "attach" (at the right panel) and then, attach each part of the model by clicking each one.
By then, you would have only 1 model now. Then you can export it and have it in browedit as 1 model.
You might notice you'll have to remake the textures.