While you are waiting for an answer please read this:
Please stop posting the same question multiple times. Show some patience. Nobody is getting paid here to answer questions. If your question does not draw any responses then either no one here knows the answer or your question is so vague that it needs rewording.
Other sources of help are...
1. AutoDesk Discussion Groups - MEP forum
2. AutoDesk Exchange
3. AutoDesk Users Group International (AUGI) website
4. The Swamp
5. CAD Everything
6. The CADforum
7. A good after-market book
8. AutoDesk website