I tried the "replicating" and made 3 identical copies of a simple object -
Then I grouped up -
say took 2 copies of "objectx" and grouped those into "rwy"
then took "rwy" and grouped it with another copy of "objectx" and grouped that into "objects"...once more again into "model"....
that left me with..
World,
Model,
Objects
Rwy
and then 4 copies of "Objectx"
I then went to the object level and deleted 3 of the 4 "objectx" leaving only one.
Don't know if it worked the way it is supposed to, but the heirachy editor looked righ, but when importing into the OE, they didn't sort themselve into the catagories (ie, All/default, void, runway...ectt..) , But they had the object type assigned once I placed them onto the tile I was working on.
But yeah - that thing is a pain in the ass.