Save Combined Object

People are building large objects that are assembled from a lot of smaller objects (stacked or placed within each other). It would be nice if there was a way to group all of those objects together and save them as a group so that they can be easily placed as one combined object. (internally it would just need to store which objects, how they are placed relative to each other, and each of the object's properties such as hue shift, then place each individual object when the combined object is placed.)