i think i have found a way to copy / extract more than one entity .
Well so far i have tested it, and it works for me, do not know if anyone would like to try this.
its not what we would like to have but just maybe it can help some users.
the same way you would link an entity in the ebe building editor, the same way it also work in the normal editor.
while you are in the normal editor, not ebe. do the following.
Well lets say you want to make a copy of a building with furniture in it.
1. place down your building.
2.press tab to see bottom half of building so that its ease to place furniture.
3. pick the furniture / entity that you want to place down, and move it on / into the building while holding down the L key,
when you hold down the l key while moving your entity onto the building, the building also becomes red. then left click with mouse, and this when will link your entity to the building just like in the ebe.
4. do this with all the furniture you want to place in the house,
5. then when you are happy with the arrangement, move mouse over building, then building and all entities will turn red that is linked with building , press extract while holding left shift and move a copy of the building with all the furniture in it.
if you like this feature , well then you can basically link any entity with anther entity and move them at he same time.
Also once you have linked the entities , and safe the map, when you open it again you can again extract the building with furniture again.
hope this will help some users.
Windows 7 Professional 64-bit
Intel(R) Pentium(R) CPU G3260 @ 3.30GHz (2 CPUs), ~3.3GHz RAM 4GB NVIDIA GeForce GT 730
DirectX Version: DirectX 11