If you can, never destroy data while constructing your 3d models. This means that you should build elements in your model in fashion that allows for easy changes. In 3d Studio Max terms this means avoiding collapsing stacks. If you do need to, then make a copy of the un-collapsed version.
(c)2012 This web site along with the 3d architectural renderings, architectural animations and all other images herein are protected materials and may not be copied or distributed without mertens3d's express written permission. 5.27.2012