Use 
                      
                        [CTRL] + [SHIFT] + [G]
                       to group 2D masks together. Go check out 
                      2D Group mask
                      Blend multiple 2D masks together
                      Read More
                       documentation for more details
                    
  This type of grouping allows you to group 2D masks to organize your compositions.
                      This is a 2D equivalent of the 
                    3D masks Group
                    A Group of 3D Mask
                    Read More
                    .
                    
