- When you say "part"; are you referring to WTPart or EPMDocument .PRT?
- Is your question about Creo parameters, or are you asking about Revision meta data stored in the the in Windchill data model?
- For your parts, do you know if you are using file-based versioning or state-based versioning?
Do not want to make any assumptions on what you are asking for assistence on. 
Thank you