Thanks for the solution, its works but not separated in diferent sub-gameobjects
“Looks like Split Geo by Group is only available for primitive groups, not point groups. You could submit an RFE to add it, but I am not sure if we are planning to provide more support for the split feature. In fact, it is currently considered a deprecated feature that is only available due to backwards compatibility.”
I need this option because the meshes are different and i can't packed and instance, i have a large road with signals and for example i split the signal meshes in zones and with occlussion or scripting i hide based on distance, and the same for vegetation or diferent houses.
I found another problem and i can´t find solution in the forum, the curve editor inside unity doesn´t work when you edit or add point the position coordinates are incorrect (like maximum axis, x:50->x:89000) and i cant modify curve .