How to generate a symbol relationship tree in vectorworks

Using vectorworks to produce MEMS mask layout means using simple symbols to form larger and complexer symbols. There is no straight way to generate the symbols relationship automatically. An possible way I sorted out is as following:

1. export your final work to vectorscript file.
2. using a matlab script I wrote to read this vectorscript file. According to the symbol function inside the script file, an relationship chart will be generated automatically.
   

At this moment, it only support the first level of the relationship.