Assemblies into assemblies

I have a bunch of sub assemblies that I need to bringtogether and create an overview or master assembly. When I try andbrowse for the sub assemblies all that shows up in the file is thepart and the drawing. Where are the sub assemblies hiding? Am I notable to import assemblies into assemblies? That wouldn't make muchsense to me. This project will take forever if I need to import allthe pieces part by part and recreate each sub assembly into themaster assembly.

This has to be something easy that I'm missing, what to do?

DonSolidworksAssemblies