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: