premiere cc: LINK audio and video tracks greyed out
There are at least three ways to put things together in Premiere Pro: linking, grouping, and nesting.  Linking is the lowest-level, assigning audio tracks to a single video clip.  You cannot link two video clips together, regardless of how much audio they may want to share.

Grouping allows you to treat multiple clips of audio and video as part of the same group for selection, moving, trimming, etc.  If you have a bunch of related clips (video and audio) which you want to behave as a unit, but whose relationships you still want to be able to see, use grouping.

Nesting creates a new sequence with all the audio and video clips you want to behave as if it's just a single entity.  You can change the relationships (and of course edit) within that entity, but to do so you have to open up that sequence on its own timeline.

You probably want to use either grouping or nesting, not linking for this case.