This manipulation got no shortcut at the time. This group type is quite different from 
                      3D Group
                      A Group of 3D Layer
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                      If you got too many mesh in your imported files and you want to put the same material (
                    3D Renderer
                    Displays a 3D geometry
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                    ) over all of them, you can Group their generators as followed :
                      First select all the mesh you want to group and do a right click:
                    
 
                    
                    
                      Then choose a 
                    3D Renderer
                    Displays a 3D geometry
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                     among the list.
                    
 
                    
                    
                      And there you go, no a single material is applied on the overall geometries. Note that in this status, 
                    3D Modifier
                    Modify a 3D geometry
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                     can also be applied on many different mesh altogether:
                    
