actually you are understanding me totlly right, this is our problem as landscape architechts, because the whole 3 layers should be considered as a fundament, and i thought maybe I can make them as a group and give only one IFC tag, but as you said it seems to be impossible. something intresting I Realized you can give IFC tag to a symbol with many objects 😞
do you have any object a a marionette Object that you can export it as IFC, if yes could you please send it to me?
thanks in advance.