If you're asking how to cut segments out of a video or audio clip, the answer is that you use the Split Clip tool (the scissors button on the Monitor panel) to slice on either side of the segment you want to remove -- then you select that segment on your timeline and press Delete on your keyboard.
I don't know any way to remove segments of the audio but leave the video intact and still keep them in sync. In fact, I don't know how that would be possible. You're either cutting out segments or you're not.
Although you can certainly cut and remove segments from both the audio and video simultaneously. That will keep them in sync, even if the cuts will be rather evident to the viewer.
