I have tried to import a wave/aiff audio to band in a box but seems that there's no audio import dialogue on mac version?

68. Can I load an audio (.wav) file into Band-in-a-Box?
In Band-in-a-Box 2006 and higher, you can use the Audio | Import audio... menu item to do import a variety of different audio file types, including MP3, WAV, WMA, and CD Audio. This may be useful if you have a Wave file that you want to add audio harmonies to using the TC-Helicon feature. If you want to add the wave file as a track to your Band-in-a-Box song, note that the wave file would need to have been recorded at a constant tempo, and you'd need to set that tempo in Band-in-a-Box - otherwise the Band-in-a-Box generated tracks will not line up with your wave file.