I haven’t installed Cubase 6 yet (it arrived yesterday) but think I can help you. You dont “import” EWQL files into Cubase actually. If you have an EWQL package ( I have several), it will create a .dll file (when the package is installed on your PC) that should be stored in the VST folder on your PC.
When Cubase starts up it scans all of the files in the VST folder so it knows what vst plug’s and instruments you have. They will then show up in Cubase.
Look in the book for something that talks about VST folder(s), creating new VST folders, scanning VST folders etc…
You’ll need the .dll file that EWQL creates when it is installed and you’ll need to know where your Cubase VST folder is. Put the EWQL .dll file in that VST folder and Cubase should find it when t starts up.