Hello Parijat,
1. Could you explain a bit more, what kind of batch loading you would need? Is it just one time operation, when you would like to load a full list of your services to OPM and check it to the OPMS server? Or are you planning to be using a file based mode for modeling? Or would you like to have some king of a query from mdb file, like Jojje is mentioning?
As for the levels, I would also recommend looking into the Named Expressions and Element templates. I believe it should work for the task you need. A bit more details on that can also be found here: communities.bentley.com/.../4870.aspx
Regards,
Justinas