Import a finished Visual Studio 2005 solution configuration to new solution

I'd like to create a clean Visual Studio 2005 VB.Net solution for an ASP.net web application, then transport it to an older solution folder, overwriting a precompiled solution file with the new blank one and all its supporting files, and keeping all of the usable code from the old solution. Then open the clean solution file and add existing items from the old solution-- is there a way to do this in one shot, or a way that takes longer but will get everything?