You can easily transfer your 06 route into Classics. If you didn't use any of the built-in content, save the file to a CDP using CMP. and import it into the Classics version CMP. This will make your route available in Classics. You'll then have to visit the DLS to get anything that's missing from the route. Beware... Some of the older content may not work in Classics because the program is more strict about errors.
If you used a lot of built-in content, this becomes more difficult. There are a quite a few threads on how to bring all of your '06 content including the built-in stuff into Classics. The same warning applies about older content.
John