Hi Micheal, thanks for the clarification, I know well how the Blocks for Autocad work, in reality it is very simple, the Autocad blocks have the characteristic that all the objects or lines on layer 0 can receive the characteristics of the layer where they are inserted and all the other levels can be customized with unique colors and properties of the block, however I hope that we can also introduce only a hierarchical level tree with sub-levels that include others already this would be fantastic, even groups could be a valid solution. 
I hope this can be evaluated for the next update because when you have over 2000 objects, it is useful to organize the elements as assemblies such as staircases or other with different colors and materials.

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Greetings