First, I'm not sure I had to do this but I dropped all tables from the DESTINATION DB using and undocumented stored procedure:
exec sp_MSforeachtable "DROP TABLE ? PRINT '? dropped' "
Script just the tables from the TARGET DB using MS SQL SERVER MANAGEMENT TOOLS. Right click on the DB and selecting TASKS > GENERATE SCRIPTS menu option. The wizard is pretty straight forward.
Run the generated script against your DESTINATION DB. Make sure you change the USE statement at the top of the script.
Now run the Import/Export Wizard. BUT WAIT, THERE'S ANOTHER CATCH ! On the screen where you select the tables to import, look at the bottom for a button labeled "EDIT MAPPINGS". On this screen, make sure you select "Enable identity insert".