I think you will have to go into the VBA file that ships with the product and make any changes you want there. The location of the file is: C:\Documents and Settings\All Users\Application Data\Autodesk\C3D 2008\enu\C3DStockSubassemblyScripts.dvb
I've been told help has a good description on how to modify/create the subassemblies, I just haven't looked at it yet.
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