I am a retard and it took me 20 years to figure this out!...
Initial trials of importing objects into models through File Forat Editor....
In the initial phase I opened the whm with the chunk I wanted.
open desired whm to put the chunk in...
Giving me a new chunk in the model.
Renaming the chunk to one of the old chunks and deleting the old chunk.
Saving and that is what I got. :P