I have such a Script on my homepage...it is quite simple to use...just select A first, then add all Ax to the selection and run the script. Modifiers will not be touched, so if A or Ax have those, the results will be References.
Look at ScriptSpot i think there is a script which makes what you want(Make instance or something) Edit: Like this:http://www.scriptspot.com/3ds-max/scripts/find-identical-geometry-and-instance-it there are more then this, i justed picked one out
It seems I have to create snapshot from A (n times) and set their positions on A1 to A(n) in a for loop and remove previous A1 to A(n) models. actually I was looking for a modifier or something to select a model(or helper) and just pick instance reference. I will do his with script, but if you know another way, please let…