how to import just audio from cam.

(The formerly given answers (2014) are not what i hoped (and very complicated to and shift-3: I do not understand how to)

I want to import only the sound of the cam.micr. (for a voice over) without the video itself saving memory.

But I don't see a import button to select that option.

So is there in 2017 maybe another simple way to do this?

Thanks!