Can i use scenes in VSE to group video tracks? I am doing my first steps in Blender's VSE and i am trying to familiarise myself with the workflow. 

I am trying to edit several video clips to produce a single output video and i would like to somehow group some of these clips together to apply common color correction, time manipulation etc and to unclutter the main timeline. For this i created a new scene (let's say scene2) by either Copy Settings or Full Copy, moved some of the clips from my main scene (let's say scene1) to it and then on the main scene i did Add > Scene... > Scene2. When i try to playback on the main timeline though, on the part of the Scene2 i either get a blank screen or a square 3D object.

What am i doing wrong? Is there a better way to achieve the same result?
If you add scene2, blender does not import the Video sequence but the 3D animation, hence the cube. You could export scene 2 in a movieclip and then import it in scene 1

You could group the clips (in scene1) by selecting the strips and then CTRL+G. ( ALT+G to ungroup)