There are some prerequisites to using Qt projects within the Carbide environment. This includes downloading the correct SDKs, building qmake to use the SDKs, and finally, building the libraries for your target environments.
You should have the Qt SDK for Symbian that works with the S60 SDK in order to develop applications with Carbide. These steps include:
Once completed, you should be able to import or create new projects using the Qt SDK for Symbian.