Thanks Gaieus, that looks like the solution I'm looking for, Happy New Year to you.

Hi all, I have a question about memory or calculating space. I want to build a model of a sculpture that in reality was made from 1000 loafs of bread. I download one loaf from the where house and start to copy and paste to build the model. Very soon the model begins to animate very slowly and the work becomes very slow. Is there a way to save the work in sections or save the end result so that it doesn’t require so much calculation space? I have tried saving as a group but this doesn’t seem to help. In the end result I will not need to view or alter any hidden geometry. I am using a new Mac so have a good graphics card.