accessing a computer-aided design (CAD) system, importing CAD data from a CAD database of the CAD system, dividing the CAD data into geometry data of a product and related data on other aspects to be suitable to a structure of a database of a rendering system, and converting the divided data into a format of the rendering system;

editing, by the rendering system, a scene based on the geometry data using the related data stored in the database;

determining whether a modification to the edited scene is requested;

if it is determined that the modification is requested, selecting a unit of data to be imported and importing modified geometry data in the selected unit;

comparing an imported part identification with a previously stored part identification; and

if the imported part identification and the previously stored part identification are the same, replacing existing geometry data corresponding to the part identification with the imported geometry data,

wherein the geometry data of a product comprises assembly data and wherein the related data on the other aspects comprises attributes and parameters unrelated to the assembly.