Does anyone know how to go about doing a "copy with mates" (or equivalent)  from one assembly to another using VBA ?

I have an automated solution for creating an assembly from a template file (save as) after configuring with database driven entry form, so the two assemblies will normally be exactly the same as far as referencing components and features, etc.  .......would like to have auto update of new components (and only new components) back to assembly template.