FD - Audio Management (Timeline)

Patching Microphone sources onto the timeline/sequence:

 

A1 - Hand held Mic - Audio CH-1 (INT)

A2 - On board Mic (Directional) - Audio CH-2 (SOTs)

A3 - Internal Mic - Audio Channel 3 (BU)

A4 - Internal Mic - Audio Channel 4 (BU)

A5 - Not patched (no audio)

A6 - Not patched (no audio)

A7 - Not patched (no audio)

A8 - Not patched (no audio)

Deselect the Linked Selection button (middle icon with the black cursor hovering over it)

Select all the audio tracks you do not want (A2 - A8)

Hit the Delete button on your keyboard

...and move on with your life!