i can open the autocad 3d true viewer drawing but unable to copy and paste in my dwg drawing.

DWG TrueView is a viewer only - it doesn't support editing operations (neither copy/paste). You can open the drawing in AutoCAD and copy/paste entities in another DWG.

Thank you.
 
where can I get free 3D blocks of people in Autocad dwg file. ( not true view )

E.g. here in the CAD Blocks section:
http://www.cadforum.cz/catalog_en/?frm=DWG&cat=14&3D=3D
 

Thank you.
I have tried all these drawings earlier but these are all in true view.
i have made my own 3d autocad drawings where i need to insert the 3d blocks of people and animals.

TrueView is an application (viewer), not a file format. All these blocks are in the DWG file format of AutoCAD and can be directly inserted in any other DWG file.

Thank you very much
 
I am able to perform the operation now
 
thanks you again