Your saying add new nodes that are added to your cmdb?
If so then I first looked at this and in our case it was not the best plan of attack- our cmdb contains many assets not to be monitored and it also lacked an approval process for adding to monitoring. I've been using the powershell scripts based off the SDK example add node and discover interfaces scripts. Plan is to the then back to a sharepoint approval task list where employees fill out form with crucial info and on approval it kicks off script.
Either way you need at least the IP address to import along with whatever you use as a foreign key to associate node to your cmdb. I use a custom property, asset tag, and there's example scripts for how to add custom property values to nodes also in the SDK download package.
Give those a try iand let us know where you get stuck...