Right-click each audio clip and UNlink it from video.
As you view, stop where desired and click the chevron to the right of the SPLIT button. Choose the desired audio-only track. This is where the audio excision will begin.
Continue to view, and stop where you want audio to commence. SPLIT the audio track. Right-click and CUT the clip that contains the unwanted audio.
Then review your work. To UNdo the previous steps click EDIT|UNDO or <ctrl-Z>.repeatedly.
To save the change, click within the sequence and press <ctrl-A> to select all, then <ctrl-C> to copy.
Open a new, blank sequence by clicking the + to the right of the sequence tab.
Click on the blank sequence and be sure that the red line is at the far left. Press <ctrl-V> to paste. The new sequence will be identical to the one copied.
Keep in mind that UNdo will apply only to changes made in THAT sequence, despite the fact that it's a copy of another sequence.