create an MSI (or other desktop installer) and deploy all required CABs one by one from it
or
trying to write a batch/command/script file which would load "WCELoad.exe" for the list of cab files.
Example:
ProcessStartInfo psi = new ProcessStartInfo();
psi.FileName = "wceload.exe";
psi.Arguments = @"some_file.CAB"; //Path goes here
Process.Start(psi);
http://social.msdn.microsoft.com/Forums/en-US/netfxcompact/thread/1988bb62-66e7-4472-861d-b4beefd6aa62