Within the Blackbird editor, multiple clips can be selected by shift clicking the clips on the timeline (hold shift, click each clip). Selected clips will inherit a light yellow highlight.

Any locked tracks on the clips will automatically by selected. Drag and move can then be used to position the related/selected clips on the timeline

Should specific tracks be required like for example, just video or excluding audio, those tracks can be unlocked and selected in the same way before movement on the timeline. The unlock status can be seen through the lock tracks at the bottom of the timeline. In this example, the second clip on the timeline has been unlocked and it is denoted by the horizontal line within the clip representation on the timeline.