Generate DevForce Model from EF Model with customizations

   I have been given an EF model in which the various EntityObjects have been customized extensively.  For example, our database contains an Employees table and a Roles table and the various tables added to the database for ASP.NET Authentication.  The developer has gone ahead and customized the EF generated Employee partial class to wrap the properties of the ASP.NET tables we need as well as the Roles table information we need into the Employee partial class.  He has also extended the partial class to "CreateUserLogin", "DeleteUserLogin", etc.

Given this EF model I now need to generate the DevForce model.  How do I go about generating the DF model so that the customization made in EF carry forward?  I went ahead and generated a model as a first attempt and checked the "Create developer partial class files" but I just get empty partial classes.

What is the proper way to handle this situation?  We're fairly new to using both EF and DEvforce and I think there is now some confusion as well as debate as to where to place all of our custom logic.