Converting an old project to CSS/XPATH

Hi,

It seems most of the updates of TestComplete are geared toward Cross Platform Testing which is great. But my question is how do you convert an old project namemapping to the one that uses CSS/XPATH as its identifiers? 

I've been looking around at the config and the namemapping itself but I can't seem to pinpoint how to do it. We have a massive project since we've been using the app for 5 years now but with everything moving to CSS/XPATH I want to update the project to be more robust. Any ideas on how to do it? Or would I have to start from scratch again (that would definitely suck)