What are the "objects" you are pasting?
What are the reference "points", are they actual points in the drawing or just coordinates to be entered manually?
Do you have an example drawing?
I would highly recommend Blender. As Irm mentioned, it's free, and it can do pretty much everything that the expensive programs can do. But, if you're creating your models in Autocad, It is a little tricky to export them to take into Blender, but it is possible, and I have a video on my Youtube channel that shows how to do it.