Hi thanks for the reply, but I’m not sure I understand what you mean.
The object was a default hanger, so was part of the FS installation, it wasn’t a custom building. I thought once the project was built and the BLG created it only needed moving to the community folder, because the building is in the list of objects already.
is that not the case…?
I have looked at all these videos 
but because they all seem to adopt a slightly different approach, they can be even more confusing. In addition they all have loads of errors in their build, I didn’t get any; which made it even more puzzling. 
I do appreciate your reply, perhaps I’m not understanding something.