App id already in use

[Senorts]

I wanted to port some of my current watchfaces to the new 300x300 resolution of the Versa and to do this I copied the project and changed the parameters and display name. But when I want to upload the .fba file I get the error "app id already in use".  
So my question is: How do I change the app id or what is the common practice of porting?

Thanks.

[JonFitbit · Accepted solution]

You just need a single project, then include the resources based on the device they are targeting.

Take a look at the guide: https://dev.fitbit.com/build/guides/multiple-devices/

[Senorts]

Perfect. Thank you.