As people have said before, NCM is not designed for monitoring via SNMP at all. It is a Network Configuration Management module.
If you want to alert on volumes, then you need to use the correct product to do so. In your case, you should look at NPM, which can very easily do all of the things you are doing above in your screen shots. Or you can just use whatever product you are going to use. Up to you.
You can't use a jar of cherries and expect an apple pie.