C# RhinoDoc.Import() .3dm file and retreive Guid's imported elements

Hello,
I’m trying to do C# function directly for Rhinoceros3d that will import elements from another .3dm file and after that will move every imported element by Vector3d(100,100,0).
I’m trying to retreive Guid Id from every imported element from imported file to then reference that Guid Id to move element but I can’t find any way how to do that.
Do you maybe know how to do that task?
Thank You in advance.
Mateusz

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