How do I select multiple pieces, so as to GROUP them

I am on the track, (edges are yellow) I have the cursor icon for a mouse, and I am unsuccessful at selecting the three tracks so I may group them. Thank you for any help on this topic, KA

To extend a selection to additional tracks:

  1. Make the selection in one track
  2. “Shift + Click” on the “Select” button for each additional track.